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JEE MAIN - Chemistry (2013 (Offline) - No. 7)

The order of stability of the following carbocations :

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 213 English
$${\rm I}{\rm I}{\rm I} > {\rm I}{\rm I} > {\rm I}$$
$${\rm I}{\rm I} > {\rm I}{\rm I}{\rm I} > {\rm I}$$
$${\rm I} > {\rm I}{\rm I} > {\rm I}{\rm I}{\rm I}$$
$${\rm I}{\rm I}{\rm I} > {\rm I} > {\rm I}{\rm I}$$

Selitys

Higher stability of allyl and aryl substituted methyl carbocation is due to dispersal of positive charge by resonance.

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 213 English Explanation 1

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 213 English Explanation 2

whereas in alkyl carbocations dispersal of positive charge on different hydrogen atoms is due to hyper conjugation hence the correct order of stability will be

JEE Main 2013 (Offline) Chemistry - Basics of Organic Chemistry Question 213 English Explanation 3

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