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Correct order of ionization enthalpy of group 13 elements is

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In < Al < Ga < Tl < B

Tl < In < Al < Ga < B

Tl < In < Ga < Al < B

In < Tl < Al < B < Ga

answer is A.

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Detailed Solution

Element	$∆_{i} H$ (kJ/mol)
B	801
Al	577
Ga	579
In	558
TI	589

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