QJEEM06Ch7192: JEE Main 2006 Chemistry - Class 11 JEEM06Ch7192 Solution: The increasing order of stability of the following free…

Question

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The increasing order of stability of the following free radicals is

A ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$
B ${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$
C ${(C{H_3})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$
D ${({C_6}{H_5})_3}\mathop C\limits^ \bullet$ < ${({C_6}{H_5})_2}\mathop C\limits^ \bullet H$ < ${(C{H_3})_3}\mathop C\limits^ \bullet$ < ${(C{H_3})_2}\mathop C\limits^ \bullet H$

Accepted Answer

The order of stability of free radicals

{\left( {{C_6}{H_5}} \right)_3}\,\mathop C\limits^ \bullet &gt; {\left( {{C_6}{H_5}} \right)_2}\mathop C\limits^ \bullet H &gt; {\left( {C{H_3}} \right)_3}\mathop C\limits^ \bullet &gt; {\left( {C{H_3}} \right)_2}\mathop C\limits^ \bullet H

The stabilisation of first two is due to resonance and last two is due to inductive effect.

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