Question

Assertion :Assertion : The acidic strength of haloacids increases in the order: HI<< HBr << HCl << HF . Reason: Reason : Strength of acid HA depends only on the electronegativity difference between H and A.

• A. If both the assertion and reason are true and reason is the correct explanation of assertion.
• B. If both the assertion and reason are true but reason is not the correct explanation of assertion.
• C. If assertion is true but reason is false
• D. If both assertion and reason are false.

Answer 1

The correct option is D If both assertion and reason are false.

The correct order of acidic strength is HF<<HCl<<HBr<<HI. While comparing elements in the same group of the periodic table, H-A bond strength is a more important factor in determining acidity than its polar nature. As the size of A increases down the group, H-A bond strength decreases and so the acid strength increases.