Hydration of alkynes catalysed by `H_2 SO_4` in presence of `Hg^(+2)` give carbonyl compounds. Which of the following is correct.

Options

A. Acetylene gives acetaldehyde
B. Terminal alkynes (R-C`-=`CH) give aldehydes
C. Non-terminal alkynes give ketones
D. All the above

Answer

D

Explanation

`(A) `Acetylene gives acetaldehyde `HC -= CH underset(Hg^(+))overset(H_2 SO_4) to [H_2 C= CH -OH ] to CH_3 -CHO`
`(C ) ` Terminal alkynes `R-C-= CH underset(H_2SO_4) overset(Hg^(+2))to [R -underset(OH) underset(|)C=CH_2] to R - underset(O) underset(||)C-CH_3`
(D) Non -terminal alkynes give ketons
`R-C-=C -R underset(H_2SO_4)overset(Hg^(+2))to [R-CH= underset(OH) underset(|)C-R ] to R- CH_2 - underset(O) underset(||)C-R ` ( ketones)