The correct order of ionization potential [IP₁] among the IIIA group elements is

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B > Ga > Al > Tl > In

B > Tl > Al > Ga > In

B > Tl > Al > Ga = In

B > Tl > Ga > Al > In

answer is D.

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Detailed Solution

I.E.Order: B >Tl >Ga > Al > In

Atomic radius order :Tl~In >Al > Ga > B

B < Ga < Al < In ~ Tl

Ionisation energy order of IIIA group elements is,B >Tl >Ga > Al > In

On moving down the group ,the ionisation energy decreases,this is true for B and Al.The ionisation energy of Ga is unexpectedly higher than that of Al.

This is due to poor shielding effect by completely filled d-orbitals in the inner shell of Ga,hence the Ga valency electrons are strongly held by nucleus therefore removal of electron from Ga is highly difficult compared to Al .

A similar increase is observed from In to Tl due to presence of 14 f-orbital electrons in the inner shell of Tl which have poor shielding effect .

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