MCQ
The correct order towards bond length is
  • A
    $C - C < C = C < C \equiv C$
  • $C \equiv C < C = C < C - C$
  • C
    $C = C < C \equiv C < C - C$
  • D
    $C = C < C - C < C \equiv C$

Answer

Correct option: B.
$C \equiv C < C = C < C - C$
b
(b) $\mathop {C \equiv C}\limits_{1.20\,{\mathop A\limits^o }} \,\, < \mathop {C = C}\limits_{1.34\,{\mathop A\limits^o }} \,\, < \mathop {C - C}\limits_{1.54\,{\mathop A\limits^o }} $

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