MCQ on Alcohols and Phenols organic chemistry

 

1. The correct order of boiling point of primary (1°), secondary (2°) and tertiary (3°) alcohols is
(a) 1° > 2° > 3°
(b) 3° > 2° > 1°
(c) 2° > 1° > 3°
(d) 2° > 3° > 1°

 

2. Dehydration of alcohol is an example of

(a)    addition reaction

(b)   elimination reaction

(c)    substitution reaction

(d)   redox reaction

3. Phenol on reduction with H₂ in the presence of Ni catalyst gives
(a) benzene
(b) toluene
(c) cyclohexane
(d) Cyclohexanol

4. Which compound is predominantly formed when phenol is allowed to react with bromine in aqueous medium?
(a) Picric acid
(b) O-Bromophenol
(c) 2, 4, 6-Tribromophenol
(d) p-Bromophenol

 

5. Phenols are more acidic than alcohols because

(a) Phenoxide ion is stablised by resonance
(b) Phenols are more soluble in polar solvents
(c) Phenoxide ion does not exhibit resonance
d) Alcohols do not lose H atoms at all

 

6. The process of converting alkyl halides into alcohols involves_____________.

 (a) addition reaction

 (b) substitution reaction

(c) dehydrohalogenation reaction

 (d) rearrangement reaction

 

7. Which of the following reagents cannot be used to distinguish between phenol and benzyl alcohol?
(a) FeCl₃
(b) Litmus soln
(c) Br₂/CCl₄
(d) All of these

 

8. Which of the following isomeric alcohols is the most soluble in water?
(a) n-Butyl alcohol
(b) Isobutyl alcohol
(c) sec-Butyl alcohol
(d) tert-Butyl alcohol

 

9. Which of the following is necessary for the bromination of phenol?
(a) CS₂
(b) FeBr₃
(c) AlCl₃
(d) BF₃

10. Phenols are not soluble in which of the following?
(a) Water
(b) Alcohol
(c) Ether
(d) Sodium hydroxide