A) \[HC\equiv CH>{{H}_{2}}C=C{{H}_{2}}>{{H}_{3}}C-C{{H}_{3}}\]
B) \[{{H}_{2}}C=C{{H}_{2}}>HC\equiv CH>{{H}_{3}}C-C{{H}_{3}}\]
C) \[C{{H}_{3}}-C{{H}_{3}}>C{{H}_{2}}=C{{H}_{2}}>HC\equiv CH\]
D) \[C{{H}_{3}}-C{{H}_{3}}>HC\equiv CH>{{H}_{2}}C=C{{H}_{2}}\]
Correct Answer: C
Solution :
Bond length decreases on increasing the bond order. Hence, the order of bond length is \[C-C(1.54\overset{o}{\mathop{\text{A}}}\,)>C=C(1.34\overset{o}{\mathop{\text{A}}}\,)>C\equiv \] \[C(1.20\overset{o}{\mathop{\text{A}}}\,)\]
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