13.5.4 Preparation of Benzene

Benzene is commercially isolated from coal tar. However, it may be prepared in the laboratory by the following methods.

(i) Cyclic polymerisation of ethyne

(ii) Decarboxylation of aromatic acids: Sodium salt of benzoic acid on heating with sodalime gives benzene.

(iii) Reduction of phenol: Phenol is reduced to benzene by passing its vapours over heated zinc dust

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