Explain why a carbonyl absorption shifts to lower frequency in an ,-unsaturated carbonyl

Chapter 13, Problem 13.53

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Explain why a carbonyl absorption shifts to lower frequency in an ,-unsaturated carbonyl compounda compound having a carbonyl group bonded directly to a carboncarbon double bond. For example, the carbonyl absorption occurs at 1720 cm1 for cyclohexanone, and at 1685 cm1 for 2-cyclohexenone. O O cyclohexanone 2-cyclohexenone (an ,-unsaturated carbonyl compound)

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