1. Tardigrade
  2. Question
  3. Chemistry
  4. Which is the correct decreasing order of stability? (i) CH3 - overset text+CH - CH3 (ii) CH3 - overset text+CH -O - CH3 (iii) CH3 overset text+CHCOCH3

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. Which is the correct decreasing order of stability?
(i) $CH_3 - \overset{\text{+}}{C}H - CH_3$
(ii) $CH_3 - \overset{\text{+}}{C}H -O - CH_3$
(iii) $CH_3 \overset{\text{+}}{C}HCOCH_3$

JIPMERJIPMER 2014Organic Chemistry – Some Basic Principles and Techniques

Solution:

Presence of -$I$ effect in a carbocation decreases delocalisation of the positive charge and hence decreases stability of the carbocation and vice-versa. Thus, the carbocation
(iii) having $-COCH_3$ group is the least stable, followed by
(ii) having $ -OCH_3$ group and followed by
(i) having only alkyl group.