Give the structures of `(A),(B)` and `(C)(`explanation is not required `).`
`i.` `(A)(C_(4)H_(8))` that adds on `HBr` in the presence and in the absence of peroxide to give the same product, `C_(4)H_(9)Br`.
`ii.` `(B)(C_(4)H_(8)),` which when treated with `H_(2)O //H_(2)SO_(4)` gives `C_(4)H_(10)O` that cannot be resolves into optical isomers.
`iii.` `(C)(C_(6)H_(12),` an optically active hydrocarbon which on catalytic hydrogenation gives an optically inactive compound, `C_(6)H_(14))`

Explanation

i. `(A)(C_(4)H_(8))` adds on `HBr` in the presence and absence of peroxide to give the same product `(C_(4)H_(9)Br)`. `(A)` should be a symmetrical alkene `(cis` and trans but `-2-` ene).

`ii.` Write all the possible structures of alkene `(C_(4)H_(8))` and find out that which one on hydration will give opticall inactive alcohol.

iii. `(C)(C_(6)H_(12))` is `O.A.,` so it is `:`