Some of the general methods of preparation of benzene are as follows:
1. Decarboxylation (Industrial Preparation)
When sodium benzoate is heated with soda lime then benzene is obtained. In this reaction there is removal of CO2.
2. From Phenol: When the vapours of phenol is passed over heated zinc dust then benzene is obtained .
3. From Cholorobenzene: Chlorobenzene is reduced with Lithium Aluminum hydride LiAlH4 or nickel-aluminum alloy in presence of alkali to give benzene .
4. From Phenyl Magnesium Halide:
5.From Ethyne: Ethyene polymerizes to benzene when it is passed over red hot copper tube .
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