question_answer

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

A)  \[{{H}_{3}}{{O}^{+}}\]                         

B)  \[BF_{4}^{-}\]

C)  \[HF_{2}^{-}\]            

D)  \[NH_{4}^{+}\]

Correct Answer: C

Solution :

Only \[HF_{2}^{-}\] has H-bonding \[[F-H-{{F}^{-}}]\] rest all the molecules have co-ordinate bonds;