Question

The alkyne which gives the above ketone as the only product after hydration with $H_{2}O,H_{2}S{O}_4$ and $HgS{O}_4$ is $x$-heptyne. What is x?

Answer 1

On hydration of 1-heptyne first, the $-OH$ group and $-H$ are added across triple bond then rearrangement takes place to form the corresponding ketone.

Here we get Hept-2-one as a product.