A) \[\text{Ga ln Al Tl}\]
B) \[\text{Al Ga ln Tl}\]
C) \[\text{Tl ln Ga Al}\]
D) \[\text{ln Tl Ga Al}\]
Correct Answer: B
Solution :
\[\text{Al Ga In Tl}\] This is due to inert pair effect or tendency of \[n{{s}^{2}}\] electrons do not participate in bond formation. This tendency decreases on moving down the group.
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