A) butane
B) propyne
C) propene
D) propane
Correct Answer: B
Solution :
We know that the bond lengths are\[C-C=1.54\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\],\[C=C=1.34\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]and\[C\equiv C=1.20\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]respectively. Since propyne has a triple bond, therefore it has the minimum bond length.
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