Which of the following is (are) the correct order of bond lengths?

C - C > C = C > C \equiv C > C \equiv N

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C = N > C = O > C = C

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C = C > C = N > C = O

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C - C > C = C > C \equiv C > C - H

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C - C > C - H > C = C > C \equiv C

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Solution

The correct options are
A $C - C > C - H > C = C > C \equiv C$
B $C - C > C = C > C \equiv C > C \equiv N$
D $C = C > C = N > C = O$
The order of bond length is single bond> double bond > triple bond. Also the nitrogen has smaller radius than carbon.
Hence, the correct order of bond lengths is $C - C > C = C > C \equiv C > C \equiv N$ .
The atomic radii decreases in the order $C > N > O$ . Hence, the correct order of the bond lengths is $C = C > C = N > C = O$
The order of bond length is single bond> double bond > triple bond. The atomic radius of $C$ is larger than that of $H$ .
Hence, the correct order of bond lengths is $C - C > C - H > C = C > C \equiv C$

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