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JEE Main201911 Jan 2019Evening ShiftChemistryp Block Elements (Group 13 & 14)Actual

The relative stability of +1 oxidation state of group 13 elements follows the order

Options

  1. AAl < Ga < Tl < In
  2. BT 1 < In < Ga < Al
  3. CGa < Al < < Tl
  4. DAl < Ga < In < Tl

Correct answer

D. Al < Ga < In < Tl

Step-by-step solution

Due to inert pair effect, the stability of +1 oxidation state increases down the group. Thus, correct order of stability is Al < Ga < In < Tl

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