Question

what alkene reacts the fastest with HBr?

Answer 1

HBr reacts with alkenes via a carbocation, the pi electrons attack the hydrogen and create a carbocation, if you form a stable carbocation, ie a tertiary, your reaction will proceed much faster if for example you had to form a secondary carbocation.

Answer 2

Give the options please

Answer 3

A)
B)
C)
D)
E)