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NEET UG CHEMISTRY MCQ: 13 TH GROUP ELEMENTS (P-BLOCK)

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The correct order of atomic radii in group 13\mathrm{13} elements is
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Correct option: A
B  <  Ga  <  Al  <  In  <  Tl\mathrm{B}\,\,\mathrm{ < }\,\,\mathrm{Ga}\,\,\mathrm{ < }\,\,\mathrm{Al}\,\,\mathrm{ < }\,\,\mathrm{In}\,\,\mathrm{ < }\,\,\mathrm{Tl}
Option A (B < Ga < Al < In < Tl\mathrm{B}\,\mathrm{ < }\,\mathrm{Ga}\,\mathrm{ < }\,\mathrm{Al}\,\mathrm{ < }\,\mathrm{In}\,\mathrm{ < }\,\mathrm{Tl}) is correct because the atomic radius generally increases down the group, but Gallium is smaller than Aluminium due to the d-block contraction.

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