Discussion
A strong sharp absorption near 1700 reciprocal centimetres suggests the presence of a
Answer: C
Correct answer: carbonyl group
The carbon-oxygen double bond is strong and highly polar, so its stretch is both high in frequency and very intense - typically 1700 to 1750 reciprocal centimetres, and one of the easiest bands to recognise. The exact position discriminates within the family: an aldehyde or ketone near 1715, an ester near 1740, an amide near 1650, and conjugation lowering each by 20 to 30.
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