Question

The major product obtained from the following reaction is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is B

One molecule of water adds to an alkyne when it is warmed with $HgS{O}_4$ and dil. $H_{2}S{O}_4$ at 333 K to forms a carbonyl compound.
The addition of $H_{2}O$ to the alkynes follows Markovnikov's rule.
Here, $-OC{H}_3$ will stabilise the positive charge on carbon at its para position so $O{H}^{-}$ gets added to carbon at para position of $-OC{H}_3$.

Then, the formed enol undergoes keto-enol tautomerism to form the keto product.

Hence, option (a) is correct.