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Question

How would you convert the following compounds into benzene?
(i) Ethyne

(ii) Ethene

(iii) Hexane

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Solution

Benzene from Ethyne: When acetylene is heated in the red-hot iron tube at 873 K, benzene is obtained.

Benzene from Ethene: Ethene was first converted into 1,2-dibromoethane by the action of bromine, tetrachloromethane. Then it is treated with alc. KOH to form bromoethene which will further react with NaNH2/liq.NH3 to form ethyne. After that ethyne is heated in the red-hot iron tube at 873 K, benzene is obtained.

Hexane to Benzene: Hexane undergoes pyrolysis in presence of chromium oxide catalyst and at high temperature and pressure, it forms benzene.


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