The correct order of Ionization potential among the Boron group elements is ?
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a
B>Ga>Al>Tl>In
b
B>Tl>Al>Ga>In
c
B>Tl>Al>Ga=In
d
B>Tl>Ga>Al>In
answer is A.
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Detailed Solution
The ionization potential of elements of this family follows a irregular trend due to d orbital contraction and f orbital contraction. Ga and Tl & have poor shielding effect of 4f & 3d-orbitals. So they have high ionization potentials.