Chemistry - CHEMICAL BONDING Question with Solution | TestHub

The correct option is (B).

In carbon monoxide (CO), Carbon (4 valence electrons) and Oxygen (6 valence electrons) share three electron pairs to complete their octets, forming a triple bond ($:C\equiv O:$) with a lone pair on each atom.

In the nitrite ion ($N{O}_2^{-}$), the central Nitrogen atom possesses a total of 6 valence electrons (including the -1 charge).

Nitrogen completes its octet by forming a double bond with one Oxygen atom, a single bond with the other Oxygen atom, and retaining one lone pair ($[\ddot{O}=\ddot{N}-\ddot{O}:{]}^{-}$).