datavorous/entrance-exam-dataset huggingface dataset:
Which of the following halogens is the most reactive in alkane substitution reactions?

Options:
A Chlorine
B Bromine
C Iodine
D Fluorine

The correct answer is:
Fluorine

Solution:
Fluorination is the most reactive among the halogenation reactions in alkane substitution due to the highly reactive nature of fluorine.

Topic: Chemistry, Hydrocarbons, NEET
Which of the following halogens reacts with hydrogen with the least affinity for hydrogen?

Options:
A Fluorine
B Chlorine
C Bromine
D Iodine

The correct answer is:
Iodine

Solution:
The affinity for hydrogen decreases from fluorine to iodine.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has a sulphide linkage in a cyclic structure?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Alitame

Solution:
Correct Option is : 4
Alitame

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following has a well developed pith?

Options:
A Dicot Root
B Monocot Root
C Gymnosperm Stem
D None of the above

The correct answer is:
Monocot Root

Solution:
Monocot roots have large and well developed pith.

Topic: Biology, Anatomy of Flowering Plants, NEET
Which of the following has an optical isomer?

Options:
A CoenNH322+
B CoH2O4en3+
C Coen2NH323+
D CoNH33Cl+

The correct answer is:
Coen2NH323+

Solution:
It is an octahedral complex of the type [M(AA)2X2] and capable of showing optical isomerism. As in rest others there is symmetry, so no optical isomerism is possible.

Topic: Chemistry, Coordination Compounds, NEET
Which of the following has been recently used for increasing the productivity of super milk cows?

Options:
A Artificial insemination by a pedigree bull only
B Superovulation of a high production cow only
C Embryo transplantation only
D A combination of superovulation, artificial insemination and embryo transplantation into a carrier cow (surrogate mother).

The correct answer is:
A combination of superovulation, artificial insemination and embryo transplantation into a carrier cow (surrogate mother).

Solution:
For increasing productivity of super milk cows, a combination of superovulation (production of exceptional numbers of ova at one time), artificial insemination(In this method, semen is collected from superior male and injected into the reproductive tract of selected female) and embryo transplantation into a carrier cow is done.

Topic: Biology, Strategies for Enhancement in Food Production, NEET
Which of the following has Buna-N synthetic rubber as copolymer synthetic rubber?

Options:
A H2C=CH-CH=CH2 and C6H5-CH=CH2
B CH2=CH-CN and CH2=CH-CH=CH2
C
D

The correct answer is:
CH2=CH-CN and CH2=CH-CH=CH2

Solution:

Topic: Chemistry, Polymers, NEET
Which of the following has distorted octahedral structure?

Options:
A SF6
B PF6-
C SiF62-
D XeF6

The correct answer is:
XeF6

Solution:
XeF6 has distorted octahedral structure. Xenon in XeF6 undergoes sp3d3 hybridisation giving pentagonal bipyramid with one axis is occupied by a lone pair. Rest other have normal octahedral structure as have sp3d2 -hybridisation.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has dry skin with scales?

Options:
A Hyla
B Hemidactylus
C Echinus
D Rana

The correct answer is:
Hemidactylus

Solution:
Hemidactylus is wall lizard - a reptile with epidermal scales. Hyla (Tree frog) and Rana (Bull frog) are amphibians that lack any exoskeleton which Echinus is sand dollar (an echinodermate - lacking scales).

Topic: Biology, Animal Kingdom, NEET
Which of the following has glycol as an important constituent?

Options:
A Dacron
B Acrilan
C Teflon
D Viscose system

The correct answer is:
Dacron

Solution:
Dacron (terylene) is a condensation polymer of ethylene glycol and terephthalic acid.

Topic: Chemistry, Polymers, NEET
Which of the following has highest acidity

Options:
A p-cresol
B m-cresol
C o-cresol
D ethanol

The correct answer is:
m-cresol

Solution:
Correct Option is : 2
m-cresol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following has highest acidity

Options:
A p-Nitrophenol
B m-Nitrophenol
C o-Nitrophenol
D Phenol

The correct answer is:
p-Nitrophenol

Solution:
Correct Option is : 1
p-Nitrophenol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following has highest bond enthalpy

Options:
A CH3F
B CH3Cl
C CH3Br
D CH3I

The correct answer is:
CH3F

Solution:
Correct Option is : 1
CH3F

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following has highest bond length

Options:
A CH3F
B CH3Cl
C CH3Br
D CH3I

The correct answer is:
CH3I

Solution:
Correct Option is : 4
CH3I

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following has highest bond length

Options:
A CH3F
B CH3Cl
C CH3Br
D CH3I

The correct answer is:
CH3Cl

Solution:
Correct Option is : 2
CH3Cl

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following has highest pKa.

Options:
A p-Nitrophenol
B m-Nitrophenol
C o-Nitrophenol
D Phenol

The correct answer is:
Phenol

Solution:
Correct Option is : 4
Phenol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following has highest pKa.

Options:
A p-cresol
B m-cresol
C o-cresol
D ethanol

The correct answer is:
ethanol

Solution:
Correct Option is : 4
ethanol

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following has highest value of Ksp?

Options:
A BeOH2
B MgOH2
C CaOH2
D BaOH2

The correct answer is:
BaOH2

Solution:
Solubility of hydroxides of alkaline earth metals increases on moving down the group. Ba(OH)2 being most soluble has highest value of Ksp whereas Be(OH)2 has least value of Ksp.

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following has intramolecular hydrogen bonding?

Options:
A H2O
B o-nitrophenol
C NH3
D CH3COOH

The correct answer is:
o-nitrophenol

Solution:
Intramolecular hydrogen bonding(within the molecule).

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has largest ionic radius ?

Options:
A Li+
B K+
C Na+
D Cs+

The correct answer is:
Cs+

Solution:
â downâtheâgroupââsizeââincrease L i + N a + K + P b + C s +

Topic: Chemistry, Classification of Elements and Periodicity in Properties, NEET
Which of the following has maximum angle strain?

Options:
A Propane
B Cyclopropane
C n-butane
D Cyclobutane

The correct answer is:
Cyclopropane

Solution:
Here cyclopropane has maximum angle strain followed by cyclobutane.
Angle strain is directly proportional to angle of deviation 'd'.
Angle strain ∝ d ∝  1 inner bond angle .

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following has maximum genetic diversity in India?

Options:
A Mango
B Wheat
C Groundnut
D Rice

The correct answer is:
Rice

Solution:
Genetic diversity is the measure of variety in genetic information contained in the organism. Oryza sativa (rice) has $32,000-50,000$ genes.

Topic: Biology, Biotechnology and Its Applications, NEET, NEET 2013 (Karnataka)
Which of the following has maximum specific heat?

Options:
A Water
B Alcohol
C Glycerine
D Oil

The correct answer is:
Water

Solution:
Water has maximum specific heat among water, alcohol, glycerine and oil. Water has specific heat 4186 J kg-1 °C-1.

Topic: Physics, Thermal Properties of Matter, NEET
Which of the following has notochord throughout life?

Options:
A Birds
B Fish
C Snake
D Amphioxus

The correct answer is:
Amphioxus

Solution:
In Cephalochordates, the notochord is persistent throughout life, and Amphioxus or Lancelet is an example of Cephalochordata. In vertebrates, the notochord is present only during the embryonic stage. In Adults, the notochord is replaced by the vertebral column.

Topic: Biology, Animal Kingdom, NEET, NEET 2020 (Phase 1)
Which of the following has PKa>0?

Options:
A HF
B HBr
C HCl
D HI

The correct answer is:
HF

Solution:
Correct Option is : 1
HF

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has proved helpful in preserving pollen as fossils?

Options:
A Oil content
B Cellulosic intine
C Pollenkitt
D Sporopollenin

The correct answer is:
Sporopollenin

Solution:
Sporopollenin is helpful in preserving pollen as fossils. The covering of pollen grain, sporoderm is consist of two layers, viz., exine and intine. The exine is made of a highly resistant fatty substance called sporopollenin. It could not be degraded by an enzyme. It is not affected by high temperature, strong acid or strong alkali. Thus, it keeps the pollen grains well-preserved as fossils.
Pollenkitt is a yellowish, viscous, sticky and oily layer that covers exine of some insect-pollinated pollen grains. Intine of pollen grains is made up of pectin and cellulose.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET, NEET 2018
Which of the following has stinging capsule or nematocytes?

Options:
A Aurelia
B Taenia
C Pleurobrachia
D Ascaris

The correct answer is:
Aurelia

Solution:
The tentacles of Aurelia or jellyfish has cnidoblast which contains the stinging capsules. Cnidoblasts are used for the anchorage, defense and for the capture of prey.

Topic: Biology, Animal Kingdom, NEET
Which of the following has the highest boiling point?

Options:
A 2-methylpropane
B Pentane
C 2-methylbutane
D 2,2-dimethylpropane

The correct answer is:
Pentane

Solution:
Correct Option is : 2
Pentane

Topic: Chemistry, Hydrocarbons, NEET
Which of the following has the highest boiling point?

Options:
A Ne
B He
C CH4
D Xe

The correct answer is:
Xe

Solution:
All the molecules are non-polar, however, Xe has the greatest van der Waal's forces so it has higher boiling point.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has the highest bond length?

Options:
A CH3F
B CH3Cl
C CH3Br
D CH3I

The correct answer is:
CH3I

Solution:
Correct Option is : 4
CH3I

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following has the highest C-X bond enthalpy?

Options:
A CH3F
B CH3Br
C CH3I
D CH3Cl

The correct answer is:
CH3F

Solution:
Correct Option is : 1
CH3F

Topic: Chemistry, Haloalkanes and Haloarenes, NEET
Which of the following has the highest density?

Options:
A Fe
B Co
C Zn
D Ni

The correct answer is:
Ni

Solution:
Correct Option is : 4
Ni

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest density?

Options:
A He
B Ne
C Ar
D Xe

The correct answer is:
Xe

Solution:
Correct Option is : 4
Xe

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has the highest dissociation constant?

Options:
A H2Se
B H2S
C H2Te
D H2O

The correct answer is:
H2Te

Solution:
Correct Option is : 3
H2Te

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has the highest enthalpy of atomisation?

Options:
A Ti
B V
C Cr
D Mn

The correct answer is:
V

Solution:
Correct Option is : 2
V

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest enthalpy of hydration?

Options:
A Ti
B V
C Cr
D Mn

The correct answer is:
Ti

Solution:
Correct Option is : 1
Ti

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest first ionisation enthalpy?

Options:
A Fe
B Ni
C Cu
D Zn

The correct answer is:
Zn

Solution:
Correct Option is : 4
Zn

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest first ionisation enthalpy?

Options:
A B
B Al
C Ga
D In

The correct answer is:
B

Solution:
Correct Option is : 1
B

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following has the highest heat of vaporization?

Options:
A HF
B HCl
C HBr
D HI

The correct answer is:
HF

Solution:
HF forms strong intermolecular H-bonds and other hydrogen halides do not form intermolecular H-bonds. Van der Waals forces increase from HCl to HI. Consequently, HF has highest heat of vaporization here.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has the highest ionic radii among lanthanoids?

Options:
A Sm3+
B Sm2+
C Eu2+
D Eu3+

The correct answer is:
Sm2+

Solution:
Correct Option is : 2
Sm2+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest Magnetic moment?

Options:
A Mn2+
B Cr2+
C Fe2+
D Co2+

The correct answer is:
Mn2+

Solution:
Correct Option is : 1
Mn2+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest melting point?

Options:
A V
B Cr
C Mn
D Fe

The correct answer is:
Cr

Solution:
Correct Option is : 2
Cr

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest melting point?

Options:
A Octane
B Nonane
C Decane
D Eicosane

The correct answer is:
Decane

Solution:
Correct Option is : 3
Decane

Topic: Chemistry, Hydrocarbons, NEET
Which of the following has the highest molar conductivity in solution-

Options:
A PtNH36Cl4
B PtNH35ClCl3
C PtNH34Cl2Cl2
D [PtNH33Cl3]Cl

The correct answer is:
PtNH36Cl4

Solution:
The molar conductivity of an electrolyte solution is the conductivity of the solution divided by the molar concentration of the dissolved electrolyte. Conductivity is proportional to the square root of the concentration of ions.
It has maximum no. of ions and hence will have more molar conductivity.
( 1 )âââââââ[Pt ( N H 3 ) 6 ]C l 4 â aq [Pt ( N H 3 ) 6 ] 4+ +4C l â â;5âions
( 2 )âââââââ[Pt ( N H 3 ) 5 Cl]C l 3 â aq [Pt ( N H 3 ) 5 Cl] 3+ +3C l â â;4âions
( 3 )âââââââ[Pt ( N H 3 ) 4 C l 2 ]C l 2 â aq [Pt ( N H 3 ) 4 C l 2 ] 2+ +2C l â â;3âions
( 4 )âââââââ[Pt ( N H 3 ) 3 C l 3 ]Cl â aq [Pt ( N H 3 ) 3 C l 3 ] + +C l â â;2âions

Topic: Chemistry, Coordination Compounds, NEET
Which of the following has the highest no. of unpaired electrons?

Options:
A Ti3+
B Ti2+
C V2+
D Cr2+

The correct answer is:
Cr2+

Solution:
Correct Option is : 4
Cr2+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest pH value?

Options:
A Milk of magnesia
B Black coffee
C Vinegar
D Lemon juice

The correct answer is:
Milk of magnesia

Solution:
Correct Option is : 1
Milk of magnesia

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following has the highest Second ionisation enthalpy?

Options:
A Fe
B Ni
C Cu
D Zn

The correct answer is:
Cu

Solution:
Correct Option is : 3
Cu

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the highest value for bond order -C6H6,CO32-,NO- and SO 4 2− ?

Options:
A C6H6
B CO32-
C NO-
D SO3

The correct answer is:
NO-

Solution:
Bond order (BO) can be calculated using the following methods:
(i) BO=Total number of bonds associated with the central atomNumber of Ï bonds associated with the central atom
(or)
BO=Total number of bonds between two atomsTotal number of resonance structures
(ii) BO=Number of bonding electrons-Number of antibonding electrons2
We use both the concepts as per situation.
Thus,
(I) We use concept (i) for the species C6H6, CO32- and SO 4 2â and concept (ii) for NO-.
On the basis of concept i
BO for C6H6=2+12=1.5
BO for CO32-=43=1.33
BO for SO 4 2â = 6 4 =1.5
On the basis of concept (ii)
BO of NO-=7+8+1
=16 electrons
â´ BO for NO-=10-62=2
Hence highest value for BO is of NO-.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has the least atomic radius?

Options:
A Mn
B Fe
C Co
D Ni

The correct answer is:
Co

Solution:
Correct Option is : 3
Co

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least Bond length?

Options:
A HI
B HBr
C HCl
D HF

The correct answer is:
HF

Solution:
Correct Option is : 4
HF

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
.Which of the following has the least electron gain enthalpy order of group 18 elements?

Options:
A Xe
B Kr
C He
D Ar

The correct answer is:
Xe

Solution:
Correct Option is : 1
Xe

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has the least enthalpy of atomisation?

Options:
A Mn
B Cr
C Fe
D Co

The correct answer is:
Mn

Solution:
Correct Option is : 1
Mn

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least ionic radii among lanthanoids?

Options:
A Er3+
B Tm2+
C Yb2+
D Lu3+

The correct answer is:
Lu3+

Solution:
Correct Option is : 4
Lu3+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least ionic radii?

Options:
A Sm2+
B Eu2+
C Ce4+
D Pr4+

The correct answer is:
Pr4+

Solution:
Correct Option is : 4
Pr4+

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least melting point?

Options:
A Fe
B Cr
C V
D Mn

The correct answer is:
Mn

Solution:
Correct Option is : 4
Mn

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least melting point?

Options:
A Mn
B Ti
C Cu
D Pd

The correct answer is:
Cu

Solution:
Correct Option is : 3
Cu

Topic: Chemistry, d and f Block Elements, NEET
Which of the following has the least tendency to dimerise?

Options:
A NO2
B ClO3
C ClO2
D Mn(CO)5

The correct answer is:
ClO2

Solution:
ClO2 has the least tendency to dimerise. As odd electron is delocalised in vacant d-orbitals.

Topic: Chemistry, p Block Elements (Group 15, 16, 17 & 18), NEET
Which of the following has the longest C−O bond length? (Free C−O bond length in CO is 1.128 Ao).

Options:
A NiCO4
B CoCO4−
C FeCO42-
D MnCO6+

The correct answer is:
FeCO42-

Solution:
Metal carbon bond in metal carbonyls possess both σ and π character. M−C π bond is formed by donation of a pair of electrons from filled orbital of metal into vacant antibonding π orbital of CO . CO bond length increases if M has more tendency to donate lone pair.
Tendency to donate lone pair is Fe2−>Co−>Ni>Mn+

Topic: Chemistry, Coordination Compounds, NEET, NEET 2016 (Phase 1)
Which of the following has the lowest boiling point?

Options:
A p - Nitrophenol
B m - Nitrophenol
C o - Nitrophenol
D Phenol

The correct answer is:
Phenol

Solution:
Boiling point∝Molecular Weight
Boiling point∝Extent of H-bond
The extent of H-bond in the phenol is very less as well as the molecular weight also less.

Topic: Chemistry, Alcohols Phenols and Ethers, NEET
Which of the following has the lowest cranial capacity?

Options:
A Homo erectus
B Homo habilis
C Modern man
D Neanderthal man

The correct answer is:
Homo habilis

Solution:
The first human-like being the hominid was called Homo habilis. The brain capacities were between 650-800cc. They probably did not eat meat. Fossils discovered in Java in 1891 revealed the next stage, i.e., Homo erectus about 1.5 mya. Homo erectus had a large brain around 900cc. Homo erectus probably ate meat. The Neanderthal man with a brain size of 1400cc lived in near east and central Asia between 1,00,000-40,000 years back.

Topic: Biology, Evolution, NEET
Which of the following has the lowest first Ionisation enthalpy?

Options:
A B
B Al
C In
D Tl

The correct answer is:
In

Solution:
Correct Option is : 3
In

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following has the lowest pH value?

Options:
A Egg white
B 0.1M NaOH solution
C Tomato Juice
D Lime water

The correct answer is:
Tomato Juice

Solution:
Correct Option is : 3
Tomato Juice

Topic: Chemistry, Ionic Equilibrium, NEET
Which of the following has the lowest second Ionisation enthalpy?

Options:
A Al
B Ga
C In
D Tl

The correct answer is:
Al

Solution:
Correct Option is : 1
Al

Topic: Chemistry, p Block Elements (Group 13 & 14), NEET
Which of the following has the maximum basicity?

Options:
A Aniline
B N-methylaniline
C N,N-dimethylaniline
D Phenylmethanamine

The correct answer is:
Phenylmethanamine

Solution:
Correct Option is : 4
Phenylmethanamine

Topic: Chemistry, Amines, NEET
Which of the following has the maximum % of the total cellular mass?

Options:
A Protein
B Carbohydrate
C Lipid
D Nucleic acid.

The correct answer is:
Protein

Solution:
Component and their % of the total cellular mass :
1. Water : 70-90 % 2. Proteins : 10-15 % 3. Nucleic acids : 5-7%
4. Carbohydrates : 3 % 5. Lipids : 2 % 6. Ions : 1%

Topic: Biology, Cell - The Unit of Life, NEET
Which of the following has the maximum resistance?

Options:
A Voltmeter
B Millivoltmeter
C Ammeter
D Milliammeter

The correct answer is:
Voltmeter

Solution:
In decreasing order of their resistance the four instruments are:
Voltmeter, millivoltmeter, milliammeter, ammeter.

Topic: Physics, Current Electricity, NEET
Which of the following has the maximum sweetness value?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Alitame

Solution:
Correct Option is : 4
Alitame

Topic: Chemistry, Chemistry in Everyday Life, NEET
Which of the following has the maximum water potential?

Options:
A Pure water
B 2% sucrose solution
C 4% glucose solution
D 10% sodium chloride solution

The correct answer is:
Pure water

Solution:
Water potential is the difference in free energy or chemical potential per unit molal volume of water in a system and that of pure water at the same temperature and pressure. The water potential of pure water is zero and it decreases on the addition of solutes.

Topic: Biology, Transport in Plants, NEET
Which of the following has the minimum bond length?

Options:
A $\mathrm{O}_2^{-}$
B $\mathrm{O}_2^{2-}$
C $\mathrm{O}_2$
D $\mathrm{O}_2^{+}$

The correct answer is:
$\mathrm{O}_2^{+}$

Solution:
Bond order of $\mathrm{O}_2^{+}=\frac{10-5}{2}=2.5$
Bond order of $\mathrm{O}_2^{-}=\frac{10-7}{2}=1.5$
Bond order of $\mathrm{O}_2^{2-}=\frac{10-8}{2}=1$
Bond order of $\mathrm{O}_2=\frac{10-6}{2}=2$
$\because$ Maximum bond order $=$ minimum bond length.
$\therefore$ Bond length is minimum for $\mathrm{O}_2^{+}$

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2011 (Screening)
Which of the following has the $p \pi-d \pi$ bonding?

Options:
A $\mathrm{NO}_3^{-}$
B $\mathrm{SO}_3^{2-}$
C $\mathrm{BO}_3^{3-}$
D $\mathrm{CO}_3^{2-}$

The correct answer is:
$\mathrm{SO}_3^{2-}$

Solution:
$\mathrm{SO}_3^{2-}$ has $\mathrm{p} \pi-\mathrm{d} \pi$ bonding.
$\pi$ backbonding, is a concept in which electrons move from an atomic orbital on one atom to an appropriate symmetry antibonding orbital on $a \pi$-acceptor ligand.
$\Rightarrow N, B$ and $C$ do not have $d$-subshell in valence shell.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET, NEET 2002
Which of the following has the regular tetrahedral structure?

Options:
A BF4-
B SF4
C [NiCN4]2-
D XeF4

The correct answer is:
BF4-

Solution:
Tetrahedral structure is associated with sp3 hybridized central atom with 4 bond pairs of electrons and without any lone pair of electrons.
Here BF4- is Tetrahedral in structure as it has 4 bond pairs of electrons
The shapes of SF4 , [NiCN4]2- and XeF4 are sea-saw, square planar and square planar respectively.

Topic: Chemistry, Chemical Bonding and Molecular Structure, NEET
Which of the following has the shortest C–Cl bond?

Options:
A Cl-CH=CH-NO2
B Cl-CH=CH-CH3
C Cl-CH=CH-OCH3
D Cl-CH=CH2

The correct answer is:
Cl-CH=CH-NO2

Solution:
Cl-CH=CH-NO2 has the shortest C–Cl bond due to resonance stabilized double bond character as follows

Topic: Chemistry, General Organic Chemistry, NEET
Which of the following has three cells?

Options:
A Antipodals
B Polar nuclei
C Synergids
D Egg cells

The correct answer is:
Antipodals

Solution:
Antipodals are three celled.

Topic: Biology, Sexual Reproduction in Flowering Plants, NEET
Which of the following has trichloro in its structure?

Options:
A Aspartame
B Saccharin
C Sucralose
D Alitame

The correct answer is:
Sucralose

Solution:
Correct Option is : 3
Sucralose

Topic: Chemistry, Chemistry in Everyday Life, NEET