• # question_answer 90)   The pairs of compounds are given below. Identify the compound in each of the pairs which has group 13 element is more stable oxidation state. The reason for your choice. State the nature of bonding also, (i) $TlCl,TlCl$ (ii) $AlC{{l}_{3}},AlCl$ (iii) $InC{{l}_{3}},InCl$

(i) $TlCl$is more stable. It is an ionic compound. Inert pair effect is maximum in thallium and therefore, +1 oxidation state is more stable than +3 state. (ii) $AlC{{l}_{3}}$ is more stable. Anhydrous state is covalent while aqueous state is ionic in nature. +3 oxidation state is more stable than +1 oxidation state. Inert pair effect is negligible. (iii) $lnC{{l}_{3}}$ is more stable. Anhydrous state is more covalent less ionic in nature. Inert pair effect is considerable but less than in thallium.