Which of the following does not contain a coordinate bond?

Options

A. `H_(3)O^(+)`
B. `BF_(4)^(-)`
C. `HF_(2)^(-)`
D. `NH_(4)^(+)`

Answer

C

Explanation

Only `HF_(2)^(-)` has H-bonding `[F-H---F]^(-).` Rest all the molecules have coordinate bonds.