question_answer

When but -3-en -2- ol reacts with aq. HBr, the product formed is [DCE 2001]

A) 3 - bromobut - 1- ene

B) 1 - bromobut - 2- ene 

C) A mixture of both a and b

D) 2 - bromobut - 2 - ene

Correct Answer: C

Solution :

   \[{{H}_{2}}\overset{\oplus }{\mathop{C}}\,-CH=CH-C{{H}_{3}}]\xrightarrow{B{{r}^{}}}\] \[\underset{\text{3 Bromobut-1-ene}}{\mathop{{{H}_{2}}C=CH-\overset{Br}{\mathop{\overset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}}}\,+\underset{\text{1 Bromo but-2-ene}}{\mathop{Br-C{{H}_{2}}-CH=CH-C{{H}_{3}}}}\,\]