Question

`Roverset(PCl_5)toAunderset(excess)overset(NaNH_2)toBoverset(H_2O)to`propyne
Identify the reactant.
A. `CH_3COCH_3`
B. `CH_3CH_2CHO`
C. `CH_3CH=CH_2`
D. `CH_3COCH_3` or `CH_3CHO`

Answer 1

Correct Answer - D
It involves a double dehydrohalogenation of a gemdichloride:
`CH_3COCH_3`
`CH_3CCl_2CH_3`
or `overset(PCl_5)to` or `overset(NaNH_2)toCH_3C-=overline(C)Na^(+)`
`CH_3CH_2CHO`
`CH_3CH_2CHCl_2`
`overset(H_2O)toCH_3C-=CH`