Question

Assertion (A): The order of acidic strength of hydrogen halides in aqueous solution is HF < HCl < HBr < HI.
Reason (R): The order of bond dissociation enthalpy of hydrogen halides is HF > HCl > HBr > HI.

• A. Both (A) and (R) are correct, (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct, (R) is not the correct explanation of (A)
• C. (A) is correct, but (R) is not correct
• D. (A) is not correct, but (R) is correct

Hint:

Acidity in water is influenced by bond strength and solvation, not only by bond dissociation energy.

Answer 1

The Correct Option is B

Acidity of HX in water depends on bond strength and solvation effects. HF has the strongest H–F bond → weakest acid in water, despite high bond dissociation enthalpy. Therefore, R is correct but does not explain A.