Which of the following has the shortest carbon-carbon bond?

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

Answer: D

Bond length decreases as bond order increases. Ethyne has a C-C triple bond (about 120 pm), shorter than ethene (134 pm), benzene (139 pm) and ethane (154 pm).

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Which of the following has the shortest carbon-carbon bond?

Answer: D

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