Question

Propose mechanism of formation of product in the following reactions-

• A. 1

Answer 1

The correct option is A 1
The pi electrons are donated to $I^{+}$ ion to form tert carbocation which rearranges into another tert carbocation by 1,2 alkyl shift. This results in ring expansion.
This is followed by nucleophilic attack of chloride ion to form the product.