MCQ
Taking stability as the factor, which one of the following represents correct relationship?
  • A
    $AlCl _3< AlCl$
  • B
    $TlCl 3> TICl$
  • C
    $TlI _3> TlI$
  • $AlCl < AlCl _3$

Answer

Correct option: D.
$AlCl < AlCl _3$
(D)
Going down the group 13, stability of lower oxidation state increase.
In case of B, Al, Ga and In , higher O.S. +3 remains more stable than lower O.S. +1 .
But in last stable element, thallium (TI), lower O.S. +1 become more stable tahn higher O.S. +3 .

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