Which among the following molecules has the shortest $C H$ bond length?

Ethane

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Ethene

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Ethyne

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All of the above have equal

C H

bond lengths

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Solution

The correct option is C Ethyne
Greater the $s -$ character, shorter the bond length. Hence, ethane with $s p^{3}$ hybridization has the longest bond length and ethyne with $s p$ hybridization has the shortest bond length.

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