Alcohols, Phenols and Ethers MCQs

An alcohol is a compound featuring one or more hydroxyl groups (-OH) directly attached to an aliphatic carbon atom. The simplest alcohol is methyl alcohol. Both alcohols and phenols have a hydroxyl group (-OH), but in carboxylic acids, the hydroxyl group is attached to a carbonyl carbon atom. Essentially, alcohols and phenols can be seen as organic analogs of water, where one hydrogen atom is replaced by an alkyl or aryl group. In alcohols, the hydroxyl group is attached to an sp³ hybridized carbon atom, whereas in phenols, it is bonded to an sp² hybridized carbon atom within an aromatic ring.

Benzenediazonium chloride on reaction with phenol in weakly basic medium gives:

(a) diphenyl ether
(b) p-hydroxyazobenzene
(c) chlorobenzene
(d) Benzene

Which of the following is formed when phenol is exposed to air?

(a) o-Benzoquinone
(b) p-Benzoquinone
(c) Phenoquinone
(d) o- and p-Benzoquinone

Which of the following is formed when glycerol is heated with oxalic acid at 503K?

(a) Glyceric acid
(b) Acrolein
(c) Allyl alcohol
(d) Methanoic acid

The alcohol which does not react with Lucas reagent is:

(a) isobutyl alcohol
(b) n-butanol
(c) tert-butyl alcohol
(d) sec-butyl alcohol

Phenol is less acidic than:

(a) acetic acid
(b) p-methoxyphenol
(c) p-nitrophenol
(d) A and C

The compound obtained by the reaction of ethene with diborane followed by hydrolysis with alkaline H2O2 is:

(a) ethanol
(b) propanol
(c) ethanol
(d) triethyl bromide

Dehydration of alcohol is an example of:

(a) addition reaction
(b) elimination reaction
(c) substitution reaction
(d) redox reaction

Phenol on reduction with H2 in the presence of Ni catalyst gives:

(a) benzene
(b) toluene
(c) cyclohexane
(d) Cyclohexanol

When phenol is treated with excess bromine water it gives:

(a) m-bromophenol
(b) o- and p-bromophenol
(c) 2,4-dibromophenol
(d) 2,4,6-tribromophenol

Phenol reacts with bromine in CS2 at low temperature to give:

(a) m-bromophenol
(b) o- and p-bromophenol
(c) p-bromophenol
(d) 2,4,6-tribromophenol