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Question

Hydrogen chloride gas and hydrogen iodide gas have different thermal stabilities. The difference is due to a difference in the energies of some of the covalent bonds that are involved in the decomposition.
Which row identities the more stable of the two compounds, and gives the correct explanation?


Identify of the more thermally stable compoundExplanation for the difference in stability
AHydrogen chloridethe Cl-Cl bond is stronger than the I-I bond
BHydrogen chloridethe H-Cl bond is stronger than the H-I bond
CHydrogen iodidethe Cl-Cl bond is stronger than the I-I bond
DHydrogen iodidethe H-Cl bond is stronger than the H-I bond

A
A
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B
B
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C
C
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D
D
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Solution

The correct option is B B
HI bond is weaker as Iodine is much larger than chlorine and cannot form an effective overlap between the s orbital of Hydrogen and the p orbital of Iodine and relatively the HCl bond is stronger due to the better overlap of the sigma bonds.
Hence HCl is more thermally stable than HI.

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