A) \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\]
B) \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}}\]
C) \[C{{H}_{2}}=CH-CH=C{{H}_{2}}\]
D) \[CH\equiv C-C\equiv CH\]
Correct Answer: D
Solution :
Bond length decrease with increase in bond-order. Hence, triple bonded carbon has minimum bond length. \[C-C\] bond-length \[=1.54\overset{\text{o}}{\mathop{\text{A}}}\,\] \[C=C\] bond-length \[=1.33\overset{\text{o}}{\mathop{\text{A}}}\,\] \[C\equiv C\] bond-length \[=1.20\overset{\text{o}}{\mathop{\text{A}}}\,\]
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