1. Tardigrade
  2. Question
  3. Chemistry
  4. The descending order of stability, of the carbonium ions C 6 H 5 overset+C H 2( I ), p( CH 3 O ) C 6 H 4 overset+C H 2( II ), p( NO 2) C 6 H 4 overset+C H 2( III ) and p( CH 3) C 6 H 4 overset+ C H 2( IV )

Question Error Report

Thank you for reporting, we will resolve it shortly

Back to Question

Q. The descending order of stability, of the carbonium ions
$ C _{6} H _{5} \overset{+}{C} H _{2}( I ), p\left( CH _{3} O \right) C _{6} H _{4} \overset{+}{C} H _{2}( II ), p\left( NO _{2}\right) C _{6} H _{4} \overset{+}{C} H _{2}( III )$ and $p\left( CH _{3}\right) C _{6} H _{4} \overset{+}{ C } H _{2}( IV )$

J & K CETJ & K CET 2009Organic Chemistry – Some Basic Principles and Techniques

Solution:

In the presence of electron releasing group, (like $ CH_{3},CH_{3}O $ ), the positive charge is dispersed more. This dispersal of positive charge stabilises the carbocation (carbonium ion). While electron withdrawing substituent (like $NO_2$ ) destabilises the carbonium ion by intensifying the positive charge. Thus, the order of stability of given benzyl carbonium ions is as

Solution Image