Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of `HgSO_4 and H_2 SO_4` ?

Options

A. `CH_3 - overset(O)overset(||)C - H`
B. `CH_3 - CH_2 - overset(O)overset(||)C - H`
C.
D. `CH_3 -overst(O)overset(||)C - CH_2CH_3`

Answer

B

Explanation

Reaction of Alkyne with `HgSO_4 and H_2SO_4` follow as
`CH-= CH underset(H_2O)overset(HgSO_4, H_2SO_4)to CH_3CHO`
`CH_3 - C -= CH underset(H_2O)overset(HgSO_4, H_2SO_2)to CH_3 - overset(O)overset(||)C - CH_3`
Hence, by this process preparation of `CH_3 CH_2 CHO` can't possible.