why TlCl does not undergo disproportionation

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Solution

Dear student,

On moving down the group of p block elements, stability of higher oxidation state decreases.Therefore, Tl has less tendency to form Tl³⁺ ion and thus it doesnot disproportionate unlike InCl in which disproportionation reaction occurs as follows:
3InCl →2In + In³⁺ + 3Cl⁻

Regards.

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