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NEET levelSingle correct optionDifficulty 1 of 3si057

A strong, sharp infrared absorption near $1715 c m^{- 1}$ in the spectrum of an organic compound indicates the presence of

Aa nitrile group ( $C \equiv N$ )
Ban alcoholic O-H group
Ca terminal $C \equiv C - H$ group
Da carbonyl group (C=O)

Answer: D

The C=O stretch of aldehydes, ketones and acids lies at about 1700-1750

c m^{- 1}

. Nitrile appears near 2250 and alcohol O-H is a broad band near 3300

c m^{- 1}

. So the band shows a carbonyl group.

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