The correct order of the thermal stability of hydrogen halides (H-X) is

Question

The correct order of the thermal stability of hydrogen halides (H-X) is (A) HI > HCl < HF > HBr (B) HCl < HF > HBr < HI (C) HF > HCl > HBr > HI (D) HI < HBr > HCl < HF

Tardigrade Admin · Accepted Answer

The H-X bond strength decreases from HF to HI. i.e. HF > HCl > HBr > HI. Thus HF is most stable while HI is least stable. The decreasing stability of the hydrogen halide is also reflected in the values of dissociation energy of the H-X bond <img class="img-fluid question-image" alt="image" src="https://cdn.tardigrade.in/img/question/chemistry/9531a2da85762b3d9efefb5c9f10e769-.png" />

Q. The correct order of the thermal stability of hydrogen halides $(H - X)$ is

$H I > H Cl < H F > H B r$

$H Cl < H F > H B r < H I$

$H F > H Cl > H B r > H I$

$H I < H B r > H Cl < H F$

The $H - X$ bond strength decreases from $H F$ to $H I$ . i.e. $H F > H Cl > H B r > H I$ . Thus HF is most stable while $H I$ is least stable. The decreasing stability of the hydrogen halide is also reflected in the values of dissociation energy of the $H - X$ bond

Q. The correct order of the thermal stability of hydrogen halides (H−X) is

HI>HCl<HF>HBr

HCl<HF>HBr<HI

HF>HCl>HBr>HI

HI<HBr>HCl<HF