Question

Acid strength of $HX(X=F,Cl,Br,I)$ is dependent on :

• A. the electronegativity differences of H and X.
• B. the tendency of the hydrated molecule to form $H^{+}$.
• C. both (A) and (B).
• D. None of the above.

Answer 1

Answer: (C)

both (A) and (B).

The acidic strength of halogen decreases from Hl > HBr > HCl > HF. This is because the size of halogen increases, HX bond becomes weaker and hence breaks easily to split off a proton.