Which of the following molecules has the shortest carbon-carbon single bond length?
A
CH2=CH−C−CH3
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B
CH2=CH−C=N
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C
CH2=CH−C=O
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D
CH2=CH−CH=CH2
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Solution
The correct option is CCH2=CH−C=O The bond between C−O in C=O will be minimum as oxygen have higher electronegativity than carbon. The C=C bond is more likely to be added upon some reagent rather than the C=O bond. The carbonyl group is more reactive than the alkene group. Hence carbon and oxygen in carbonyl compound will be more attracted towards each other. Hence they have small bond length.