Complete the reaction.

Explanation:

The given reaction is a dehydration reaction that proceeds with ring expansion.      

The mechanism of reaction is shown with the help of diagram below:

In the above reaction, the reagent used is conc. H₂SO₄ ,which is a dehydrating agent.

In the first step H+ is released by reagent which gets attached to OH group forming H₂O  as seen in the reaction above. H₂O  being a weak base is good leaving group , hence moving out. While the four-membered ring expands to a five-membered more stable ring via ring expansion.

Final Answer :

The product of given reaction, is thus shown as below: