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A dichloroderivative (A) on treating wit...

A dichloroderivative (A) on treating with KCN followed by acid hydroysis and heating gives a monobasic acid (B) along with liberation of `CO_2`. (B) on heating with liquid ammonia followed by treating with `Br_2//KOH` gives (C ) which on treating with `NaNO_2` and HCl at low temperature followed by oxidation gives a monobasic acid (D) having molecular mass 74. 'C' in the whole process would be

A

ethyl amine

B

propyl amine

C

tert-butyl amine

D

cyclopentyl amine.

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