Q69 / 197 · NEET 2009 (Mains) · Chemistry

The stability of +1 oxidation state increases in the sequence :

  • A
    $\mathrm{Ga} < $ In $ < \mathrm{Al} < \mathrm{Tl}$
  • Correct answer
    B
    $\mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl}$
  • C
    $\mathrm{Tl} < $ In $ < \mathrm{Ga} < \mathrm{Al}$
  • D
    In $ < \mathrm{Tl} < \mathrm{Ga} < \mathrm{Al}$

Solution

$+\mathrm{I}$ stability down the group increase due to inert pair effect $$ \mathrm{Al} < \mathrm{Ga} < \mathrm{In} < \mathrm{Tl} $$

Hence, the correct answer is option: 'B'.

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