Hydrocarbons

Given below are 4 reactions. Two of these reactions will give product which is an equimolar mixture of the d and 1 forms. Identify these 2 reactions.

[A] 2- Methylpropene + \(\mathrm{HI} \rightarrow\) ---------

[B] But-1-ene + \(\mathrm{HBr} \rightarrow\) -----------

[C] 3-Methylbut-1-ene + \(\mathrm{HI} \rightarrow\) -----------

[D] 3- Phenylpropene + \(\mathrm{HBr}\) (Peroxide) \(\rightarrow\) -----------