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NEET levelSingle correct optionDifficulty 1 of 3si061

Which of the following compounds shows a broad infrared absorption band centred near $3300 c m^{- 1}$ and no strong band in the $1700$ - $1750 c m^{- 1}$ region?

Aethanol, $CH X_{3} CH X_{2} OH$
Bethanal, $CH X_{3} CHO$
Cethyl ethanoate, $CH X_{3} COOC X_{2} H X_{5}$
Dpropanone, $CH X_{3} COCH X_{3}$

Answer: A

Broad O-H stretching near 3300

c m^{- 1}

is due to hydrogen-bonded O-H of an alcohol. The other three contain C=O and absorb strongly near 1700-1750

c m^{- 1}

without an O-H band.

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