Question

Which of the following most accurately describes the first step in the reaction of $HCl$ with but-1-ene?

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

Addition of $HCl$ takes place through carbocation intermediate formation. Free radical mechanism is there in case of $HBr$ with peroxide. So, (a) is incorrect.
Addition of chlorine takes place at last step at the place where carbocation intermediate is formed.
So (d) is incorrect.
Attack of alkene takes place, while forming a more stable secondary carbocation instead of primary carbocation.
So (b) is the correct option