Ionisation enthalpy (\Delta i H_1 kJ mol^{-1}) for the elements of Group 13 follows the order.
(i) B > Al > Ga > In > Tl

(ii) B < Al < Ga < In < Tl

(iii) B < Al > Ga < In > Tl

(iv) B > Al < Ga > In < Tl

Answers (1)

The answer is the option l(iv) B > Al < Ga > In < Tl

The ionization energy decreases on moving down a group, and the atomic size increases. Till Ga, the ionization energy increases slightly but soon starts decreasing due to the shielding effect of d-electrons and increases once the shielding effect is less. Thus the nuclear energy increase when the ionization energy rises.

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