All carbon-carbon bonds in benzene have a length of about 139 pm. This value is ____.
Correct answer C. between a C–C single bond (154 pm) and a C=C double bond (134 pm)
Explanation
Delocalisation of the π electrons over the ring makes every C–C bond identical, with a bond order of about 1.5. Its length is therefore intermediate between typical single and double bonds.
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