NEET 2023 — Chemistry solution

NEET2023Chemistry

Taking stability as the factor, which one of the following represents correct relationship?

A
$InI_{3} > InI$
B
$AlCl > AlCl_{3}$
C
$TlI > TlI_{3}$
D
$TlCl_{3} > TlCl$

Solution

Going down group 13, the inert-pair effect makes the lower oxidation state increasingly stable. For thallium (the heaviest stable group-13 element here), the $+ 1$ state is far more stable than $+ 3$ .

So among Tl compounds, $TlI$ (Tl $^{+}$ ) is more stable than $TlI_{3}$ (Tl $^{3 +}$ ). For Al and In, the $+ 3$ state is still preferred.

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