Question

In the reaction
`(CH_(3))_(2)C-CH=CH_(2) + HBr rarr`
the chief product is
A. `(CH_(3))_(2)underset(Br)underset(|)(C )-CH(CH_(3))_(2)`
B. `(CH_(3))_(3)C-underset(Br)underset(|)(CH)-CH_(3)`
C. `(CH_(3))_(3)CH_(2)CH_(2)Br`
D. `(CH_(3))_(2)CHunderset(CH_(3))underset(|)CHBr`

Answer 1

Correct Answer - A
In the absence of peroxide, the reaction follows ionic mechanism. Initial formed carbocation undergoes rerrangement:

`underset(3^(@)"carbocation(More stable)")(CH_(3)-underset(+)overset(CH_(3))overset(|)(C ) underset(CH_(3))underset(|)(CH)CH_(3)overset(Br)rarrCH_(3)-underset(Br)underset(|)overset(CH_(3))overset(|)(C)underset(CH_(3))underset(|)(CH)CH_(3))`