Select the correct statement(s) about the anomalous behaviour of fluorine.

A $F X_{2}$ oxidises water to $O X_{2}$ and $HF$
B $HF$ boils at a higher temperature than $HCl$ because of hydrogen bonding
CThe electron gain enthalpy of F is more negative than that of Cl
D $F X^{-}$ has the largest magnitude of hydration enthalpy among the halide ions

Answer: A, B, D

2 F X_{2} + 2 H X_{2} O 4 HF + O X_{2}

is correct, and hydrogen bonding in HF raises its boiling point. The small

F X^{-}

is the most strongly hydrated halide ion. The electron gain enthalpy of Cl (

- 349

) is more negative than that of F (

- 328 kJ mo l^{- 1}

), so option 3 is false.