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Q. Shortest $ C-C $ bond length is present in:

BVP MedicalBVP Medical 2004

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}}}\, $