Explain the mechanism of addition of hydrogen bromide to propene.

Explanation

The mechanism of addition of hydrogen bromide to propene takes place in three step.
Step 1: Hydrogen bromide dissociates into `H^(+)` and `Br^(-)`
`H - Br rarr H^(+) + Br^(-)`
Step 2: the electrophile `H^(+)` attacks propene to form carbocation.

of the two carbocations (I) and (II), carbocations (I) is more stable and is formed more readily.
Step 3: The nucleophile Br attacks the carbocation (I) to give 2 - Bromopropane.
`CH_(3) - overset(+)(CH) - CH_(3) + overset(-)(Br) rarr CH_(3) - underset(Br)underset(|)(CH) - CH_(3)`