1. Tardigrade
  2. Question
  3. Chemistry
  4. Decreasing order of stability of ions is (i) CH3 - C+H - CH3 (ii) CH3-C+H-OCH3 (iii) CH3 - C+H - COCH3

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Q. Decreasing order of stability of ions is
(i) $\quad$$CH_3 - C^+H - CH_3$
(ii) $\quad$$CH_3-C^+H-OCH_3$
(iii) $\quad$$CH_3 - C^+H - COCH_3$

AIIMSAIIMS 2009Organic Chemistry – Some Basic Principles and Techniques

Solution:

The dispersal of the charge stabilizes the carbocation. More the number of electron donating groups are present, greater the dispersal of positive charge and therefore more the stability of carbocation can be observed.
So, the order is

$CH _{3}- \overset{+}{C}H - OCH _{3} > CH _{3} - \overset{+}{C}H - CH _{3} > CH _{3}- \overset{+}{C}H - COCH _{3} $