First slide

Atomic and physical properties

Question

The tendency to form monovalent compounds among the Group 13 elements is correctly exhibited in :

Moderate

A

$B < Al < Ga < In < T l$
B

$Tl < In < Ga < Al < B$
C

$T l \approx I n < G a < A l < B$
D

$B \approx Al \approx Ga \approx In \approx Tl$

Solution

Monovalent Compounds of $13^{t h}$ Group indicate stability of +1 oxidation state.
Down the group stability of “+1” Oxidation state increases due to inert pair effect.
$T l^{+ 1}$ is most stable but $T l^{+ 3}$ is unstable
$∴$ Stability of monovalent compounds follow the order
B < Al < Ga < In < Tl

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