NEET Organic Chemistry 2 — Questions and Answers
Question 1: What is the product when a carboxylic acid reacts with an alcohol in the presence of acid catalyst?
- Ether
- Ester (Correct answer)
- Ketone
- Aldehyde
Correct answer: Ester
Esterification is the reaction between a carboxylic acid and an alcohol (with H2SO4 catalyst) to produce an ester and water.
Question 2: Which reagent is used to distinguish between aldehydes and ketones in Tollens' test?
- Fehling's solution
- Ammoniacal silver nitrate (Tollens' reagent) (Correct answer)
- Benedict's solution
- Acidified KMnO4
Correct answer: Ammoniacal silver nitrate (Tollens' reagent)
Tollens' reagent (ammoniacal silver nitrate) is reduced by aldehydes to form a silver mirror, but ketones do not react.
Question 3: What is the hybridization of carbon atoms in ethylene (ethene, CH2=CH2)?
- sp3
- sp2 (Correct answer)
- sp
- sp3d
Correct answer: sp2
Each carbon in ethene undergoes sp2 hybridization, forming three sigma bonds and leaving one unhybridized p orbital for the pi bond.
Question 4: Which reaction mechanism does benzene typically undergo?
- Nucleophilic addition
- Electrophilic addition
- Electrophilic substitution (Correct answer)
- Free radical addition
Correct answer: Electrophilic substitution
Benzene undergoes electrophilic aromatic substitution (EAS) because addition would destroy the stable aromatic ring system.
Question 5: What is the functional group present in amines?
- -OH
- -COOH
- -NH2 (Correct answer)
- -CHO
Correct answer: -NH2
Amines contain the amino (-NH2) functional group, making them derivatives of ammonia where hydrogen atoms are replaced by organic groups.
Question 6: Which organic compound is produced by the fermentation of glucose?
- Methanol
- Acetic acid
- Ethanol (Correct answer)
- Glycerol
Correct answer: Ethanol
Yeast ferments glucose (C6H12O6) anaerobically to produce ethanol (C2H5OH) and carbon dioxide.
NEET Organic Chemistry 2
What is the product when a carboxylic acid reacts with an alcohol in the presence of acid catalyst?