question_answer

The stability of +1 oxidation state among Al,                                     [NEET 2015 (Re)] Ga, In and Tl increases in the sequence

A) \[Ga<\ln <Al<Tl\]

B) \[Al<Ga<\ln <Tl\]

C)                                                              

D)

Correct Answer: B

Solution :

[b] This is due to inert pair effect or tendency of  electrons do not participate in bond formation. This tendency decreases on moving down the group.