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JEE Main levelSingle correct optionDifficulty 2 of 3si072

Which compound shows a medium, sharp infrared band near $2250 c m^{- 1}$ ?

Apropanal, $CH X_{3} CH X_{2} CHO$
Bpropanoic acid, $CH X_{3} CH X_{2} COOH$
Cpropan-1-amine, $CH X_{3} CH X_{2} CH X_{2} NH X_{2}$
Dpropanenitrile, $CH X_{3} CH X_{2} CN$

Answer: D

The

C \equiv N

stretch of nitriles occurs at about 2250

c m^{- 1}

. The aldehyde and acid show C=O near 1700-1750, the acid also a very broad O-H, and the amine shows N-H bands near 3300-3500

c m^{- 1}

.

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