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Question
How would you convert the following compounds into benzene?
(i) Ethyne
(ii) Ethene
(iii) Hexane
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.
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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