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JEE Main levelSingle correct optionDifficulty 2 of 3cb095

The correct order of carbon-carbon bond length is

A $C X_{2} H X_{6} > C X_{6} H X_{6} > C X_{2} H X_{4} > C X_{2} H X_{2}$
B $C X_{2} H X_{2} > C X_{2} H X_{4} > C X_{6} H X_{6} > C X_{2} H X_{6}$
C $C X_{2} H X_{6} > C X_{2} H X_{4} > C X_{6} H X_{6} > C X_{2} H X_{2}$
D $C X_{6} H X_{6} > C X_{2} H X_{6} > C X_{2} H X_{4} > C X_{2} H X_{2}$

Answer: A

Typical lengths are 154 pm (ethane), 139 pm (benzene, bond order 1.5), 134 pm (ethene) and 120 pm (ethyne). Length falls as bond order rises.

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