Question

Arrange the following in the order of increasing acidic strength
(A) HCl
(B) HBr
(C) HI
(D) HF
Choose the correct answer from the options given below:

• A. (A), (B), (C), (D).
• B. (D), (A), (B), (C).
• C. (B), (A), (D), (C).
• D. (C), (B), (A), (D).

Hint:

Acidic strength increases with decreasing bond strength between hydrogen and the halogen.

Answer 1

The Correct Option is D

Step 1: Hydrohalic Acid Acidity
The acidity of hydrogen halides increases as the H-halogen bond strength weakens. A weaker bond facilitates hydrogen ion dissociation, thus increasing acidity.
Step 2: Bond Dissociation Energy
- HF exhibits a strong H-F bond, rendering it the weakest acid.
- HCl, HBr, and HI demonstrate successively weaker bonds.
Step 3: Acid Strength Order
The order of increasing acidity is: \[ \text{HI}>\text{HBr}>\text{HCl}>\text{HF} \]
Final Answer: \[ \boxed{\text{(C), (B), (A), (D)}} \]