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Question
Assertion (A): Increasing order of acidity of hydrogen halides is \[\ce{HF < HCl < HBr < HI}\]
Reason (R): While comparing acids formed by the elements belonging to the same group of periodic table, \[\ce{H - A}\] bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.
Options
Both A and R are true and R is the correct explanation of A.
Both A and R are true but R is not the correct explanation of A.
A is true but R is false.
Both A and R are false.
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Solution
Both A and R are true and R is the correct explanation of A.
Explanation:
As, \[\ce{H - A}\] bond strength is a more important factor in determining acidity than its polar nature. As the size of A increases down the group, \[\ce{H - A}\] bond strength decreases.
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