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Which of the following compounds does not exhibit resonance? (1) CH3CH2OCH = CH2 (2) Benzene ring–CH2OH (benzyl alcohol structure) (3) CH3CH2CH2CONH2 (4) CH3CH2CH = CH–CHCH2NH2

1. CH3CH2OCH = CH2
2. Benzene ring–CH2OH
3. CH3CH2CH2CONH2
4. CH3CH2CH = CH–CHCH2NH2

Correct answer: CH3CH2CH = CH–CHCH2NH2

Solution

The compound CH3CH2CH = CH–CHCH2NH2 does not exhibit resonance because it lacks a conjugated system or delocalized electrons that would allow for resonance structures; instead, it contains isolated double bonds that do not contribute to resonance.

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