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Q.

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

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a

B

b

Tl

c

Tl≈In

d

B≈Al≈Ga≈In≈Tl

answer is A.

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Detailed Solution

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