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Three pairs of compounds are given below. Identify that compound in each of the pairs which has group 13 element in more stable oxidation state.
Give reason for your choice. State the nature of bonding also.
(i) TlCl_{3}, TlCl
(ii) AlCl_{3} , AlCl
(iii) InCl_{3}, InCl

Answers (1)

i) 

TlCl  is more stable as the inert pair effect strengthens the oxidation state.

ii)

AlCl_3 has no inert pair effect but instead is a covalent compound and thus accept electrons to become stable, acting as a Lewis acid.

iii)

Due to inert pair effect, Indium exists in both +1 and +3 oxidation states out of which +3 oxidation state is more stable is more stable than +1 oxidation state. In other words, InCl3 is more stable than InCl.

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