The correct order of the thermal stability of hydrogen halides $(\mathrm{H}-\mathrm{X})$ is

The correct order of the thermal stability of hydrogen halides $(\mathrm{H}-\mathrm{X})$ is
  1. $\mathrm{HI}>\mathrm{HBr}>\mathrm{HCl}>\mathrm{HF}$
  2. $\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}$
  3. $H C l < H F < H B r < H I$
  4. $H I>H C l < H F < H B r$

Solution

As we move down the group in hydrogen halides the thermal stability decreases due to decrease in bond strength. So the correct order of thermal stability is $\mathrm{HF}>\mathrm{HCl}>\mathrm{HBr}>\mathrm{HI}$
Hence, option (b) is correct. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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