A) methane
B) ethane
C) ethene
D) ethyne
Correct Answer: D
Solution :
Due to smaller size of sp-orbital (as compared to\[s{{p}^{2}}\](in ethene) or\[s{{p}^{3}}\](in methane and ethane))\[C-H\]\[(1.06\overset{o}{\mathop{\text{A}}}\,)\]and\[C-C\]\[(1.20\overset{o}{\mathop{\text{A}}}\,)\] distance are the shortest in ethyne.
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