Which of the following molecule has longest C = C bond length?

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CH₃-CH=CH-CH₃

CH₃-CH=CH-CH=CH-CH₃

CH₂=CH₂

CH₂=CH-CH=CH₂

answer is D.

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Detailed Solution

Due to resonance and H.C. double bond length increases and single bond length decreases.
(1) No resonance only pure double bond.
(2) Only H.C. (6 $α$ -H)
(3) Conjugated system, only resonance.
(a) Conjugated system both R and H.C. so has longest (C = C) bond length.

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