1.

Amongst the following compounds, the one(s) which readily react with ethanolic KCN is

Answer»

ethyl chloride
chlorobenzene
benzaldehyde
salicylic acid.

Solution :`overset(-)CN` is a very good nucleophile. KCN can REACT with `1^(@)` halide i.e. `H_(3)CH_(2)Cl` to give `CH_(3)CH_(2)CN.`

`overset(-)CN` is very good nucleophile and a very good leaving gorup. `overset(+)Koverset(-)CN` react with benzaldehyde to caryy Benzoin condensation to give `pH-overset(OH)overset("|")"CH"-overset(O)overset(||)C-Ph`.

Chlorobenzene is inert to KCN because a PARTIAL double bond character is PRODUCED between chloride and benzene ring due to resonance.
`rarr` Salicylic acid does not react with KCN.


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