2nd Year Chemistry Chapter 11 Test11. Carbonyl Compounds

Q1. Multiple choice questions (Attempt all · 10 × 1 = 10)

1. Ethanoic acid is oxidized to carbon dioxide and water by:
   1. Fehling’s solution
   2. KMnO₄
   3. Tollen’s reagent
   4. HCl
2. How does chlorine substitution affect the acidity of carboxylic acids?
   1. It increases acidity by donating electrons
   2. It decreases acidity by withdrawing electrons
   3. It increases acidity by withdrawing electrons
   4. It increases acidity by withdrawing hydrogen
3. Which ion is produced when carboxylic acids dissolve in water?
   1. OH⁻
   2. Cl⁻
   3. H⁺
   4. Na⁺
4. The reactivity of carboxylic acids is mainly due to the presence of:
   1. Hydroxyl group
   2. Carbonyl group
   3. Alkyl group
   4. Aryl group
5. In aldehydes, the carbonyl group is attached to:
   1. Two alkyl groups
   2. One hydrogen and an alkyl group
   3. Two aryl groups
   4. One hydroxyl group
6. The relative acidity of chlorinated carboxylic acids is primarily due to:
   1. Increased stability of the conjugate base
   2. Electron-donating effects of the chlorine atom
   3. Lowering of the carboxylate pKₐ
   4. Increased electron density around the carbonyl group
7. Which of the following acyl chlorides is expected to hydrolyze most readily?
   1. Methyl chloride
   2. Acetyl chloride
   3. Phenyl chloride
   4. Benzyl chloride
8. Which test can oxidize methanoic acid to produce a silver mirror?
   1. Fehling’s solution
   2. Tollen’s reagent
   3. Benedict’s solution
   4. Iodine solution
9. In most reactions of carboxylic acids:
   1. The hydroxyl group is lost
   2. The carboxyl group is retained
   3. The alkyl group reacts
   4. The carbonyl group is destroyed
10. Which compound is the strongest acid among the following?
    1. Ethanol
    2. Phenol
    3. Ethanoic acid
    4. Methanol