A hydrocarbon (A) with molecular formula `C_(8)H_(8)` gave the following reactions :
(i) On shaking with bromine a bromo derivative (B) with the composition `C_(8)H_(8)Br_(2)` was formed.
(ii) The rapid oxidation of hydrocarbon with alkaline `KMnO_(4)` gave a monobasic (C) .
(iii) The acid (C) on distillation with soda lime gave benzene.
Deduce the structures of (A). (B) and (C) and name the compound (A).

Explanation

The compound (A) forms an addition compound with bromine hence (A) should be an unsaturated hydrocarbon . Since (A) on oxidation gives a monobasic acid which on distillation with soda lime forms benzene (A) should be a benzene derivative having unsaturated side-chain.
The possible hydrocarbon (A) can be :

the name of hydrocarbon (A) is styene.