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Q.

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

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a

CH2=CH2

b

CH3-CH=CH-CH3

c

CH2=CH-CH=CH2

d

CH3-CH=CH-CH=CH-CH3

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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