How do we get benzene from acetylene? Give the corresponding equation. Explain the halogenation, alkylation, acylation, nitration and sulphonation of benzene.

Explanation

Preparation of Benzene from acetylene : On passing acety-
lens gas through red hot iron tubes, it trimerises to give benzene.

Chemical Properties:
(1) Halogenation : Benzene reacts with chlorine in the presence of `Fe Cl _(3) of Al Cl _(3)` to give chloro-benzene.
(2) Friedel - Craft.s Alkylation : Benzene reacts with alkyl halides in the presence of `Al Cl _(3)` to give alkyl benzene.