Only one of the following three alkyl halides can be prepared as the major product of the

Question:

Only one of the following three alkyl halides can be prepared as the major product of the addition of HBr to an alkene. Which compound can be prepared in this way? Explain why the other two cannot be prepared in this way. CH3CHCHCHCHBr A Br I CHCHCH,CH,CH, B Br I CH3 H3C-CH-C-CH5 I CH3 C