Question

Statement I: Acidic strength increases in the order given as
$HF<<HCl<<HBr<<HI$

Statement II: As the size of the elements $F,Cl,Br,I$ increases down the group, the bond strength of $HF,HCl,HBr,\text{and}HI$ decreases and so the acidic strength increases.

In the light of the above statements, choose the correct answer from the options given below.

• A. Both Statement I and Statement II are true
• B. Both Statement I and Statement II are false
• C. Statement I is true but Statement II is false
• D. Statement I is false but statement II is true

Answer 1

The correct option is A Both Statement I and Statement II are true

Acidic strength of hydracids increase in order,
$HF<<HCl<<HBr<<HI$

So, statement I is true.

The above order of acidic strength is due to decrease in bond strength as the size of the halogen atom increase, bond length of $C-X$ increases.

Thus, statement I and statement II are true.
Option A is the correct answer.