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

CHEMISTRY · Single correct · A Level · Chemistry · Bonding · Bonding

Problem

Which of the following does not contain any co-ordinate bond? (1)

\text{H}_3\text{O}^+

(2)

\text{BF}_4^-

(3)

\text{HF}_2^-

(4)

\text{NH}_4^+