Question

Which one of the following has longest covalent bond distance?

• A. C-C
• B. C-H
• C. C-N
• D. C-O

Answer 1

The correct option is A C-C

Generally, the bond length of polar bonds (C-O & CN) will be small compared to that of non-polar bonds i.e. C-C bond and C-H bond. But C-H bond length is greater than C-C bond length because the electronegativity difference is zero in C-C bond.

Hence, C-C has the longest covalent bond distance.

Option A is correct.