Discussion
The covalent bond length is almost the same in which of the following pairs of bonds
Answer: C
The pair with almost the same bond length is C=O and N=O.
Standard tables give about 121 pm for C=O and about 122 pm for N=O, a difference of only 1 pm.
The other pairs differ more: C-H (about 107 pm) and O-H (about 96 pm); C=C (133 pm) and C=N (about 128 pm); C-C (154 pm) and C-N (about 147 pm); C-O (about 143 pm) and N-O (about 136 pm).
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