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Carbon - Carbon bond length values of four hydrocarbons is 134 pm, 154 pm, 139 pm and 121 pm. Carbon - Carbon bond length in Benzene is

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121 pm

134 pm

139 pm

154 pm

answer is C.

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Detailed Solution

$C - C (154 pm) > C = C (134 pm) > C \equiv C (121 pm)$
Due to resonance, the C - C bond length in benzene is intermediate of single and double bonds.
C - C bond length in benzene is 139 pm

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