Question

Which of the following does not contain co-ordinate bond?

• A. $\stackrel{+}{P{H}_4}$
• B. $N{O}_2$
• C. $O_3$
• D. $C{O}_3^{2-}$

Answer 1

The correct option is D $C{O}_3^{2-}$

The carbonate ion is bonded like this: the negative charges are found on $2$ of the oxygen atoms. Carbonate cannot form a co-ordinate bond using the $O-$atom in double $C-O$ bond because oxygen is most stable when it has two non-bonding pairs. The $O$ atom is already in a favorable state and would not like to form a co-ordinate bond,