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 :
Key Idea: \[\therefore \] \[C\equiv C\] has shortest bond length among C-C, C = C and \[C\equiv C\] C - C bond length = 1.54 \[\overset{o}{\mathop{A}}\,\] C = C bond length = 1.33 \[\overset{o}{\mathop{A}}\,\] \[C\equiv C\] bond length = 1.20 \[\overset{o}{\mathop{A}}\,\] The compound having shortest carbon-carbon bond length is \[CH\equiv C-C\equiv CH\].
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