Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Question

Note: In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question. Assertion (A): Increasing order of acidity of hydrogen halides is HF < HCl < HBr < HI Reason (R): While comparing acids formed by the elements belonging to the same group of periodic table, H–A bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond.

Philoid · Accepted Answer

HA bond strength is a more important factor in determining acidity of an acid than the polar nature of the bond. As the size of halide increases, bond becomes weaker and the acidity increases.

Since order of size of given halides will be F < Cl < Br < I

As the size of halide will increase, the bond between H and halide will weaken and acidity will increase.

Therefore, Increasing order of acidity of hydrogen halides is HF < HCl < HBr < HI.