datavorous/entrance-exam-dataset huggingface dataset:
Which of the following reactions is a part of the large scale industrial preparation of nitric acid?

Options:
A $\mathrm{NaNO}_3+\mathrm{H}_2 \mathrm{SO}_4 \frac{\mathrm{Pt}}{500 \mathrm{~K}, 9 \mathrm{bar}} \mathrm{NaHSO}_4 +\mathrm{HNO}_3$
B $4 \mathrm{NH}_3+5 \mathrm{O}_2 \text { (from air) } \frac{\mathrm{Pt}}{500 \mathrm{~K}, 9 \text { bar }} 4 \mathrm{NO} + 6 \mathrm{H}_2 \mathrm{O}$
C $4 \mathrm{HPO}_3+2 \mathrm{~N}_2 \mathrm{O}_5 \frac{\mathrm{Pt}}{500 \mathrm{~K}, 9 \text { bar }} 4 \mathrm{HNO}_3 +\mathrm{P}_4 \mathrm{O}_{10}$
D $\mathrm{Cu}\left(\mathrm{NO}_3\right)_2+2 \mathrm{NO}_2+2 \mathrm{H}_2 \mathrm{O} \underset{500 \mathrm{Pt}, 9 \mathrm{bar}}{\stackrel{\mathrm{ba}}{\longrightarrow}} 4 \mathrm{HNO}_3+\mathrm{Cu}$

The correct answer is:
$4 \mathrm{NH}_3+5 \mathrm{O}_2 \text { (from air) } \frac{\mathrm{Pt}}{500 \mathrm{~K}, 9 \text { bar }} 4 \mathrm{NO} + 6 \mathrm{H}_2 \mathrm{O}$

Solution:
The balanced chemical equation involved in manufacturing of \(\mathrm{HNO}_3\) by Ostwald's process are shown as:
Step 1 Formation of nitric oxide (NO)
\(4 \mathrm{NH}_3(\mathrm{~g})+5 \mathrm{O}_2(\mathrm{~g}) \xrightarrow[500 \mathrm{~K}, 9 \text { bar }]{\stackrel{\mathrm{Pt} / \mathrm{Rh} \text {, gases- catalyst }}{ }} 4 \mathrm{NO}(\mathrm{g})+6 \mathrm{H}_2 \mathrm{O}\)
Step 2 Formation of nitrogen dioxide \(\left(\mathrm{NO}_2\right)\)
\(2 \mathrm{NO}(\mathrm{g})+\mathrm{O}_2(\mathrm{g}) \rightarrow 2 \mathrm{NO}_2(\mathrm{~g})\)
Step 3 Absorption of \(\mathrm{NO}_2\) (Formation of \(\mathrm{HNO}_3\) )
\(3 \mathrm{NO}_2(\mathrm{~g})+\mathrm{H}_2 \mathrm{O} \rightarrow 2 \mathrm{HNO}_3(\mathrm{I})+\mathrm{NO}(\mathrm{g})\)

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET, NEET 2022 (Phase 2)
Which of the following reactions is an example of nucleophilic substitution reaction?

Options:
A $\mathrm{RX}+\mathrm{KOH} \longrightarrow \mathrm{ROH}+\mathrm{KX}$
B $2 \mathrm{RX}+2 \mathrm{Na} \longrightarrow \mathrm{R}-\mathrm{R}+2 \mathrm{NaX}$
C $\mathrm{RX}+\mathrm{H}_2 \longrightarrow \mathrm{RH}+\mathrm{HX}$
D $\mathrm{RX}+\mathrm{Mg} \longrightarrow \mathrm{RMgX}$

The correct answer is:
$\mathrm{RX}+\mathrm{KOH} \longrightarrow \mathrm{ROH}+\mathrm{KX}$

Solution:
Key Idea Nucleophilic substitution reactions involve substitution (replacement) of a group or atom by a nucleophile.
$$
\begin{aligned}
& \mathrm{KOH} \longrightarrow \mathrm{K}^{+}+\mathrm{OH}^{-} \\
& \mathrm{RX}+\underset{\text { nucleophile }}{\mathrm{OH}^{-}} \longrightarrow \mathrm{R}-\mathrm{OH}+\mathrm{KX} \\
&
\end{aligned}
$$

Topic: Chemistry, Haloalkanes and Haloarenes, NEET, NEET 2009 (Screening)
Which of the following reactions is appropriate for converting acetamide to methanamine?

Options:
A Hoffmamn bromamide reaction
B Stephens reaction
C Gabriels phthalimide synthesis
D Carbylamine reaction

The correct answer is:
Hoffmamn bromamide reaction

Solution:
Hoffmamn bromamide reaction is used here to convert acetamide to methanamine as follows
CH3-C||O-NH2+Br2+4KOH→CH3NH2+2KBr+K2CO3+2H2O

Topic: Chemistry, Amines, NEET
Which of the following reactions is employed to produce ozone in the laboratory?

Options:
A Exposure of air to UV light
B Reaction of F2 with H2O at low temperature
C Reaction of SO2 with H2O2
D Passage of silent electric discharge through oxygen

The correct answer is:
Passage of silent electric discharge through oxygen

Solution:
Ozone is formed, when energy is supplied to dioxygen in the form of UV radiation or silent electric discharge.
3O2(g)â2O3(g) ; ÎH=142.7 kJmol-1
Since O3 is an endothermic molecule, so it is necessary to use a silent electric discharge, otherwise sparking would generate heat and decompose it. This is the laboratory method.
A. Exposure of O2 to UV light also form O3 . This occurs in atmosphere, when photochemical smog is formed over cities like Delhi, Los Angeles or Tokyo.
B. 2H2O+2F2â4HF+O2
3H2O+3F2â6HF+O3
C. SO2+H2O2âH2SO4

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following reactions is involved in the formation of the brown ring in the ring test of NO3– ion when Fe2+ ion reduces nitrate ion to nitric oxide and combines with Fe2+ (aq) ion?

Options:
A Fe2++ NO3–→ NO2+ Fe3+
B NO3–+ 3Fe2++ 4H+→ NO + 3Fe3++ 2H2O
C NO2–+ 3Fe2++ 4H+→ NO + 3Fe3++ 2H2O
D NO3–+ 3Fe2++ 4H+→ NO + 2Fe3++ 2H2O

The correct answer is:
NO3–+ 3Fe2++ 4H+→ NO + 3Fe3++ 2H2O

Solution:
Correct Option is : (B)
NO3–+ 3Fe2++ 4H+→ NO + 3Fe3++ 2H2O

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following reactions is not an example for nucleophilic addition-elimination reaction?

Options:
A $\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NaHSO}_3 \rightleftharpoons \mathrm{CH}_3-\stackrel{\huge \mathrm{~OH} \atop |}{\underset{| \atop \huge \mathrm{H}}{\mathrm{C}}}-\mathrm{OSO}_2 \mathrm{Na}$
B $\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NH}_2 \mathrm{OH} \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{N}-\mathrm{OH}+\mathrm{H}_2 \mathrm{O}$
C $\mathrm{CH}_3 \mathrm{CHO}+\mathrm{C}_6 \mathrm{H}_5 \mathrm{NHNH}_2 \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{N}-\mathrm{NHC}_6 \mathrm{H}_5+\mathrm{H}_2 \mathrm{O}$
D $\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NH}_3 \rightleftharpoons \mathrm{CH}_3 \mathrm{CH}=\mathrm{NH}+\mathrm{H}_2 \mathrm{O}$

The correct answer is:
$\mathrm{CH}_3 \mathrm{CHO}+\mathrm{NaHSO}_3 \rightleftharpoons \mathrm{CH}_3-\stackrel{\huge \mathrm{~OH} \atop |}{\underset{| \atop \huge \mathrm{H}}{\mathrm{C}}}-\mathrm{OSO}_2 \mathrm{Na}$

Solution:
Nucleophilic addition - elimination reaction is associated with elimination of $\mathrm{H}_2 \mathrm{O}$.
Here the above reaction is an addition reaction.

Topic: Chemistry, Aldehydes and Ketones, NEET, NEET 2022 (Phase 2)
Which of the following reactions is the metal displacement reaction? Choose the right option.

Options:
A \(2 \mathrm{KClO}_3 \xrightarrow{\Delta} 2 \mathrm{KCl}+3 \mathrm{O}_2\)
B \(\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow{\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}\)
C \(\mathrm{Fe}+2 \mathrm{HCl} \rightarrow \mathrm{FeCl}_2+\mathrm{H}_2 \uparrow\)
D \(2 \mathrm{~Pb}\left(\mathrm{NO}_3\right)_2 \rightarrow 2 \mathrm{PbO}+4 \mathrm{NO}_2+\mathrm{O}_2 \uparrow\)

The correct answer is:
\(\mathrm{Cr}_2 \mathrm{O}_3+2 \mathrm{Al} \xrightarrow{\Delta} \mathrm{Al}_2 \mathrm{O}_3+2 \mathrm{Cr}\)

Solution:
Metal displacement reaction is

Topic: Chemistry, Redox Reactions, NEET, NEET 2021
Which of the following reactions of D-glucose cannot be explained by its open chain structure?

Options:
A Oxidation of D-glucose to gluconic acid.
B Formation of an osazone derivative.
C Despite having the aldehyde group, glucose does not give Schiff’s test and it does not form the hydrogen sulfite addition product with NaHSO3.
D Reaction with Tollens' reagent to form a silver mirror.

The correct answer is:
Despite having the aldehyde group, glucose does not give Schiff’s test and it does not form the hydrogen sulfite addition product with NaHSO3.

Solution:
Correct Option is : (C)
Despite having the aldehyde group, glucose does not give Schiff’s test and it does not form the hydrogen sulfite addition product with NaHSO3.

Topic: Chemistry, Biomolecules, NEET
Which of the following reactions represents the formation of an oxide of nitrogen when nitric acid reacts with P4O10?

Options:
A 4 HNO3+ P4O10→ 4 H3PO4+ 2 N2O5
B 2 HNO3+ P4O10→ 2 H3PO4+ 2 NO2+ H2O
C 3 HNO3+ P4O10→ 3 H3PO4+ 3 NO2+ 3 H2O
D HNO3+ P4O10→ H3PO4+ NO2+ H2O

The correct answer is:
4 HNO3+ P4O10→ 4 H3PO4+ 2 N2O5

Solution:
Correct Option is : (A)
4 HNO3+ P4O10→ 4 H3PO4+ 2 N2O5

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following reactions will get affected by increasing the pressure? Also, mention whether change will cause the reaction to go into forward or backward direction. (i) COCl2(g) ⇌ CO (g) + Cl2(g) (ii) CH4(g) + 2S2(g) ⇌ CS2(g) + 2H2S (g) (iii) CO2(g) + C (s) ⇌ 2CO (g) (iv) 2H2(g) + CO (g) ⇌ CH3OH (g) (v) CaCO3(s) ⇌ CaO (s) + CO2(g) (vi) 4 NH3(g) + 5O2(g) ⇌ 4NO (g) + 6H2O (g)

Options:
A (i), Backward; (ii), Forward; (iii), Forward; (iv), Forward; (v), Backward; (vi), Backward
B (i), Forward; (ii), Forward; (iii), Forward; (iv), Backward; (v), Backward; (vi), Backward
C (i), Backward; (ii), Backward; (iii), Forward; (iv), Forward; (v), Backward; (vi), Forward
D (i), Forward; (ii), Forward; (iii), Forward; (iv), Forward; (v), Backward; (vi), Forward

The correct answer is:
(i), Forward; (ii), Forward; (iii), Forward; (iv), Backward; (v), Backward; (vi), Backward

Solution:
Correct Option is : (B)
(i), Forward; (ii), Forward; (iii), Forward; (iv), Backward; (v), Backward; (vi), Backward

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following reactions will not give pure propane?

Options:
A CH3CH2Cl+2Na+ClCH3→ether
B CH3CH2CH2COONa→sodalime
C CH3CH=CH2→H2/Pd
D CH3C≡CH→H2/Pd

The correct answer is:
CH3CH2Cl+2Na+ClCH3→ether

Solution:
Here in option A reaction will not give pure propane
CH3CH2Cl+2Na+ClCH2CH3→dryetherCH3CH2CH2CH3+2NaCl
CH3Cl+2Na+ClCH3→dryetherCH3CH3+2NaCl
CH3CH2Cl+2Na+ClCH3→dryetherCH3CH2CH3+NaCl
Thus, we get a mixture containing butane, ethane and propane.
In rest other reaction pure propane is possible.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following reactions will not result in the formation of carbon- carbon bonds?

Options:
A Friedal- Crafts acylation
B Reimer- Tieman reaction
C Cannizaro reaction
D Wurtz reaction

The correct answer is:
Cannizaro reaction

Solution:
In cannizaro reaction C-C cannot be formed as here the compound (aldehyde) having no Î±-H- atom undergoes disproportion with a strong base to give an alcohol and an acid salt for eg.
2HCHOâconc.NaOHHCOONa+CH3OH
While in all other reactions C-C bond formation occur.
Friedal- Crafts acylation:-
Reimer- Tieman reaction:-
Wurtz reaction:-

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following reactions will not result in the formation of carbon-carbon bonds ?

Options:
A Reimer-Tiemann reaction
B Cannizaro reaction
C Wurtz reaction
D Friedel-Crafts acylation

The correct answer is:
Cannizaro reaction

Solution:
(a) Reimer-Tiemann reaction,
(Here, a new $\mathrm{C}-\mathrm{C}$ bond is formed.)
(b) Cannizaro reaction,
$$
2 \mathrm{HCHO} \stackrel{\text { Conc. } \mathrm{NaOH}}{\longrightarrow} \mathrm{CH}_3 \mathrm{OH}+\mathrm{HCOONa}
$$
(No new $\mathrm{C}-\mathrm{C}$ bond is formed in this reaction.)
(c) Wurtz reaction,
$$
2 \mathrm{RX}+\text { dry Na } \stackrel{\text { Ether }}{\longrightarrow} \mathrm{R}-\mathrm{R}
$$
(One new $\mathrm{C}-\mathrm{C}$ bond is formed.)
(d) Friedel-Crafts acylation,
Thus, among the given reactions, only Cannizaro reaction does not involve the formation of a new $\mathrm{C}-\mathrm{C}$ bond.

Topic: Chemistry, Aldehydes and Ketones, NEET, NEET 2010 (Screening)
Which of the following reagent is used for the conversion of 2-hexyne into trans-2-hexene

Options:
A H2,PtO2
B NaBH4
C H2/Pd/BaSO4
D Li-NH3/C2H5OH

The correct answer is:
Li-NH3/C2H5OH

Solution:
The partial reduction of alkynes by active metal in liquid ammonia takes place through trans vinylic anion which ultimately produces trans alkene.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following reagent used to identify fructose?

Options:
A Neutral FeCl3
B CHCl3/ alc KOH
C Ammoniacal AgNO3
D Iodine

The correct answer is:
Ammoniacal AgNO3

Solution:
Fructose is oxidized by ammoniacal AgNO3 .
Therefore Ammoniacal AgNO3 reagent is used to identify fructose .

Topic: Chemistry, Biomolecules, NEET
Which of the following reagents can be used for conversion of Butan-1-ol to butanoic acid?

Options:
A HCI / NaNO2
B CI3and AICI3
C PCI5
D Jones reagent

The correct answer is:
Jones reagent

Solution:
Correct Option is : (D)
Jones reagent

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following reagents can be used for conversion of Butanal to butanoic acid?

Options:
A Ammoniacal AgNO3(Tollen’s reagent)
B Br2in CCI4
C NaOH in ethanol
D Tin in hydrochloric acid

The correct answer is:
Ammoniacal AgNO3(Tollen’s reagent)

Solution:
Correct Option is : (A)
Ammoniacal AgNO3(Tollen’s reagent)

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following reagents can be used for conversion of Cyclohexene to hexane-1,6-dioic acid?

Options:
A LiAlH4
B KMnO4-H2SO4/ heat
C NaBH4
D DIBAL-H

The correct answer is:
KMnO4-H2SO4/ heat

Solution:
Correct Option is : (B)
KMnO4-H2SO4/ heat

Topic: Chemistry, Aldehydes and Ketones, NEET
Which of the following reagents can be used for converting C6H5–CH2–Cl into C6H5–CH2–CH2–NH2

Options:
A Hinsberg reagent
B Wilkinson reagent
C Ethanolic NaCN followed by acetylation
D Ethanolic NaCN followed by treating H2/ Ni on the product

The correct answer is:
Ethanolic NaCN followed by treating H2/ Ni on the product

Solution:
Correct Option is : (D)
Ethanolic NaCN followed by treating H2/ Ni on the product

Topic: Chemistry, Amines, NEET
Which of the following reagents can be used for converting CH3–CH2–Cl into CH3–CH2–CH2–NH2

Options:
A Ethanolic NaCN followed by reduction
B C2H5OH
C Ethanolic NaCN followed by oxidation
D Hinsberg reagent

The correct answer is:
Ethanolic NaCN followed by reduction

Solution:
Correct Option is : (A)
Ethanolic NaCN followed by reduction

Topic: Chemistry, Amines, NEET
Which of the following reagents can be used for the conversion of ethanol to ethanal?

Options:
A LiAlH4
B Br2/ CCl4
C Pyridinium Chlorochromate [PCC]
D NaI / Acetone

The correct answer is:
Pyridinium Chlorochromate [PCC]

Solution:
Correct Option is : (C)
Pyridinium Chlorochromate [PCC]

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents can be used for the conversion of ethanol to ethanoic acid?

Options:
A NaBH4
B Acidified KMnO4or K2Cr2O7
C Pyridinium Chlorochromate [PCC]
D NaI / Acetone

The correct answer is:
Acidified KMnO4or K2Cr2O7

Solution:
Correct Option is : (B)
Acidified KMnO4or K2Cr2O7

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents cannot be used to distinguish between phenol and benzyl alcohol?

Options:
A Br2/CCl4
B NaOH
C NaHCO3
D FeCl3 (neutral)

The correct answer is:
NaHCO3

Solution:
Option A, B and D all react with phenol and none of them reacts with benzyl alcohol. NaHCO3 neither reacts with phenol nor with benzyl alcohol. Therefore, it cannot be used to distinguish between the given compounds.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents convert the propene to 1-propanol

Options:
A H2O, H2SO4
B Aqueous KOH
C MgSO 4 , NaBH 4 / H 2 O
D B2H6, H2O2, OH-

The correct answer is:
B2H6, H2O2, OH-

Solution:
In Markownikoff propane giving 2-propanol while in "Markownikoff's addition" takes place B2H6, H2O2, OH- reagents convert the propene to 1-propanol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is commonly used for the reduction of alkyl halides to hydrocarbons in nucleophilic substitution reactions?

Options:
A Sodium iodide (NaI)
B Sodium hydroxide (NaOH)
C Sodium borohydride (NaBH4)
D Lithium aluminium hydride (LiAlH4)

The correct answer is:
Lithium aluminium hydride (LiAlH4)

Solution:
Lithium aluminium hydride is often used for the reduction of alkyl halides to hydrocarbons in nucleophilic substitution reactions.

Topic: Chemistry, Amines, NEET
Which of the following reagents is commonly used for the substitution of a halogen atom with a hydroxide ion in a haloalkane?

Options:
A Sodium iodide (NaI)
B Sodium hydroxide (NaOH)
C Potassium cyanide (KCN)
D Ammonia (NH3)

The correct answer is:
Sodium hydroxide (NaOH)

Solution:
Sodium hydroxide is often used for the substitution of a halogen atom with a hydroxide ion (nucleophilic substitution).

Topic: Chemistry, Amines, NEET
Which of the following reagents is commonly used for the substitution of a halogen atom with an alkyl group in a haloalkane?

Options:
A Sodium iodide (NaI)
B Sodium hydroxide (NaOH)
C Sodium borohydride (NaBH4)
D Lithium aluminium hydride (LiAlH4)

The correct answer is:
Sodium iodide (NaI)

Solution:
Sodium iodide is often used for the substitution of a halogen atom with an alkyl group.

Topic: Chemistry, Amines, NEET
Which of the following reagents is commonly used to convert phenol to benzene in the presence of zinc dust?

Options:
A Nitric acid
B Hydrogen peroxide
C Sulfuric acid
D Sodium hydroxide

The correct answer is:
Sulfuric acid

Solution:
Sulfuric acid is commonly used in the conversion of phenol to benzene when zinc dust is employed as the reducing agent.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is commonly used to test for the presence of unsaturation in organic compounds?

Options:
A Fehling's solution
B Tollen's reagent
C Baeyer's reagent
D Lucas reagent

The correct answer is:
Baeyer's reagent

Solution:
Baeyer's reagent, which is a cold, dilute, aqueous solution of potassium permanganate, is commonly used to test for the presence of unsaturation in organic compounds by observing its decolorization during the reaction.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following reagents is NOT involved in the Grignard reaction?

Options:
A Alkene
B Aldehyde
C Ketone
D Grignard reagent

The correct answer is:
Alkene

Solution:
Alkenes are not typically involved in the Grignard reaction.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is not involved in the process of reducing carboxylic acids to primary alcohols?

Options:
A Lithium aluminium hydride
B Hydrogen peroxide
C Palladium on Carbon (Pd/
C)
D Sodium hydroxide

The correct answer is:
Sodium hydroxide

Solution:
Sodium hydroxide is not typically involved in the process of reducing carboxylic acids to primary alcohols using either lithium aluminium hydride or catalytic hydrogenation.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is used for the preparation of alkyl bromides by heating alcohols?

Options:
A Phosphorus tribromide
B Thionyl chloride
C Sodium iodide
D Concentrated HCl

The correct answer is:
Phosphorus tribromide

Solution:
Alkyl bromides can be prepared by heating alcohols with phosphorus tribromide.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is used to initiate the Grignard reaction?

Options:
A Sodium metal
B Magnesium metal
C Ethanol
D Hydrochloric acid (HCl)

The correct answer is:
Magnesium metal

Solution:
Magnesium metal is typically used to initiate the Grignard reaction.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following reagents is used to reverse sulphonation and convert benzenesulfonic acid back into benzene?

Options:
A Oleum
B Sodium hydroxide
C Sulfuric acid
D Hydrogen peroxide

The correct answer is:
Sodium hydroxide

Solution:
Sodium hydroxide is commonly used to reverse sulphonation and convert benzenesulfonic acid back into benzene.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following reagents react(s) with C6H5CH2CONH2 to form C6H5CH2CN ?

Options:
A P2O5
B SOCl2
C POCl3 or PCl5
D All of the above

The correct answer is:
All of the above

Solution:
Dehydration occurs with all the three reagents.
C6H5CH2CONH2→P2O5C6H5CH2CN+H2O
C6H5CH2CONH2→SOCl2C6H5CH2CN+SO2+2HCl
C6H5CH2CONH2→POCl3orPCl5C6H5CH2CN+H2O

Topic: Chemistry, Carboxylic Acid Derivatives, NEET
Which of the following reagents would distinguish cis-cyclopenta-1, 2-diol from the trans-isomer?

Options:
A Acetone
B Ozone
C MnO2
D Aluminium isopropoxide

The correct answer is:
Acetone

Solution:
While with trans cyclopenta -1,2 diol it will not form any product

Topic: Chemistry, Alcohols Phenols and Ethers, NEET, NEET 2016 (Phase 1)
Which of the following receivers, R1 or R2, picks up the larger signal when source B is turned off, given that four identical monochromatic sources A, B, C, and D, producing waves of the same wavelength λ, are coherent?

Options:
A R1 picks up a larger signal
B R2 picks up a larger signal
C Both R1 and R2 pick up an equal signal
D None of the receivers pick up any signal

The correct answer is:
Both R1 and R2 pick up an equal signal

Solution:
Correct Option is : (C)
Both R1 and R2 pick up an equal signal

Topic: Chemistry, Wave Optics, NEET
Which of the following receptors helps in perception of taste?

Options:
A Taste buds situated on the anterior two-thirds of the tongue
B Gustatory receptors which are chemoreceptors
C Olfactory receptors which are chemoreceptors
D Stato-accoustic receptors

The correct answer is:
Gustatory receptors which are chemoreceptors

Solution:
The different kinds of tastes are perceived with the help of gustatory receptors situated in the taste buds present on the tongue. The brain integrates the different inputs from the taste buds and perceives a complex flavor. The olfactory receptors are responsible for the perception of smell. The auditory receptors are responsible for the perception of sounds.

Topic: Biology, Digestion and Absorption, NEET
Which of the following refer to correct example(s) of organisms which have evolved due to changes in environment brought about by anthropogenic action?

(a) Darwin’s Finches of Galapagos islands.
(b) Herbicide resistant weeds.
(c) Drug resistant eukaryotes.
(d) Man-created breeds of domesticated animals like dogs.

Options:
A (a) and (c)
B (b), (c) and (d)
C only (d)
D only (a)

The correct answer is:
(b), (c) and (d)

Solution:
Anthropogenic action: The evolution of various organisms due to human activities or human interference, it is called evolution due to anthropogenic action.

1. Development of antibiotics or drug resistance varieties.

2. Development of herbicides resistance varieties.

3. Artificial selection.

Artificial selection: Artificial selection is the selective breeding of plants or animals for desired traits. It is done artificially by employing various breeding methods and that is why it is called artificial selection. Following are examples of artificial selection.

1. Generation of different vegetables like Broccoli, Kale, Cauliflower, etc. from wild cabbage.

2. Generation of different breeds of dogs, cows, sheep.

Topic: Biology, Evolution, NEET, NEET 2020 (Phase 1)
Which of the following regions of the brain is incorrectly paired with its function?

Options:
A Medulla oblongata - homeostatic control
B Cerebellum - language comprehension
C Corpus callosum - communication between the left and right cerebral cortices
D Cerebrum - calculation and contemplation

The correct answer is:
Cerebellum - language comprehension

Solution:
The cerebellum is involved in the coordination of voluntary motor movement, balance and equilibrium and not language comprehension. It is located just above the brain stem and toward the back of the brain.

Topic: Biology, Neural Control and Coordination, NEET, NEET 2015 (Phase 1)
Which of the following regions of the brain is incorrectly paired with its function?

Options:
A Medulla oblongata - homeostatic control
B Cerebellum - language comprehension
C Corpus callosum - communication between the left and right cerebral cortices
D Cerebrum - calculation and contemplation

The correct answer is:
Cerebellum - language comprehension

Solution:
The cerebellum is involved in the coordination of voluntary motor movement, balance and equilibrium and not language comprehension. It is located just above the brain stem and toward the back of the brain.

Topic: Biology, Neural Control and Coordination, NEET
Which of the following regions of the globe exhibits the highest species diversity?

Options:
A Madagascar
B Himalayas
C Amazon forests
D Western Ghats of India

The correct answer is:
Amazon forests

Solution:
Tropical Amazonian rain forest in South America has the greatest biodiversity on earth. The Amazonian rain forest are also called lungs of the planet. Amazon forests occupy the tropical belt with climatic conditions being hot and humid. This condition is responsible for a variety of plant growth followed by the dependent heterotrophs.

Topic: Biology, Biodiversity and its Conservation, NEET, NEET 2020 (Phase 1)