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  4. The C-H and C-C bond distance are shortest in

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Q. The $ C-H $ and $ C-C $ bond distance are shortest in

Uttarkhand PMTUttarkhand PMT 2007

Solution:

Due to smaller size of $sp$-orbital (as compared to $ sp^{2} $ (in ethene) or
$ sp^{3} $ (in methane and ethane))
$ C-H (1.06\,\mathring{A}) $ and
$ C-C (1.20\,\mathring{A}) $
distance are the shortest in ethyne.