Match the following $I R$ frequencies with samples 1, 2, and 3.

IR frequencies Samples

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Solution

A-1800 B-1650 C-1750
Amides show two resonance forms so amide bond between carbonyl carbon and the amide nitrogen has double bond character. So it has maximum energy value and strongest bond. Therefore it has less frequency.

Esters exhibit less resonance so the bonds are not that strong and the least resonance is shown by acetyl chloride so it is weakest. Therefore it has higher frequency.

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Match the following IR frequencies with samples 1, 2, and 3.IR frequencies Samples

Match the following $I R$ frequencies with samples 1, 2, and 3.

IR frequencies Samples