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

  • Option 1)

    H\! I>H\! Br>H\! Cl>H\! F

  • Option 2)

    H\! F>H\! Cl>H\! Br>H\! I

  • Option 3)

    H\! Cl<H\! F>H\! Br<H\! I

  • Option 4)

    H\! I>H\! Cl<H\! F>H\! Br

 

Answers (1)
D Divya Saini

As we learnt in 

Thermal Stability of Hydride -

HF>HCl>HBr>HI

- wherein

Thermal stability increases with increase in electronegativity difference 

 

 As the bond strength increases, stability decreases.

\therefore Thermal Stability :HF>HCl>HBr>HI


Option 1)

H\! I>H\! Br>H\! Cl>H\! F

This option is incorrect.

Option 2)

H\! F>H\! Cl>H\! Br>H\! I

This option is correct.

Option 3)

H\! Cl<H\! F>H\! Br<H\! I

This option is incorrect.

Option 4)

H\! I>H\! Cl<H\! F>H\! Br

This option is incorrect.

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