Answer:
Inert pair
effect is maximum in thallium. Due to this, only \[6{{p}^{1}}\] electron
participates in bond formation and thus, the stable oxidation state of thallium
is +1 and not +3. Therefore, \[TlCl\] is stable but \[TlC{{l}_{3}}\] is not
stable.
\[BC{{l}_{3}}\]is a covalent
compound. Boron shows an oxidation state +3 as the inert pair effect does not
exist. All the three valence electrons take part in bond formation. However, it
is an electron deficient compound but due to back donation by chlorine atom, it
gets extra stability. Thus, \[BC{{l}_{3}}\] is more stable than\[TlC{{l}_{3}}\].
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