Multiple Choice

In the destructive distillation of coal, at 443-503 K temperature, a middle oil or carbolic oil fraction is obtained. This fraction contains :

APhenol
Correct Answer
BXylene
CNaphthalene
Correct Answer
DBenzene

Solution

(3) Distillation of coal tar : Arenes are isolated by fractional distillation of coal tar,

Table :

Name of the fraction
Temperature range (K)

Main constituents
Light oil (or crude oil) fraction

Upto 443

Benzene, toluene, xylene

Middle oil fraction (Carbolic oil)

443-503

Phenol, naphthalene, pyridine

Heavy oil fraction (Creosote oil)

503-543

Naphthalene, naphthol and cresol

Green oil (Anthracene oil)

543-633

Anthracene, phenanthrene

Pitch (left as residue)

Non-volatile

Carbon

So at 443-503 K temperature phenol and naphthalene is formed

Hence options A & C are correct.

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