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. \[C\text{ }\text{ }Cbond\text{ }length\text{ }=\text{ }1.54\text{ }{\AA}\] \[C\text{ }=\text{ }Cbond\text{ }length\text{ }=\text{ }1.33\text{ }{\AA}\] \[C~Cbond\text{ }length\text{ }=\text{ }1.22\text{ }{\AA}\]
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