TASK DEFINITION: In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.
PROBLEM: Question: The reaction between a ketone and a Grignard reagent causes, after hydrolysing the salt formed, a: 
 Options:  <0> Carboxylic ester. <1> Alcohol. <2> Ether. <3> Aldehyde. <4> Carboxylic acid.

SOLUTION: chemistry

PROBLEM: Question: A spontaneous process is characterized because: 
 Options:  <0> In isolated systems the entropy decreases (ΔS <0). <1> At constant pressure and temperature, the Gibbs energy decreases (ΔG <0). <2> At constant pressure and temperature, the Helmholtz energy decreases (ΔA <0). <3> At constant volume and temperature, the Gibbs energy increases (ΔG> 0). <4> It is reversible.

SOLUTION: pharmacology

PROBLEM: Question: Which of the following molecules has at least a 90º angle ?: 
 Options:  <0> H2O. <1> NH3. <2> CH4 <3> SF4. <4> BF3.

SOLUTION:
pharmacology