The correct order of stability of alkyl radical is

Question

The correct order of stability of alkyl radical is (A)  overset bulletCH ( CH 3)2< overset bulletCH 3< overset bulletCH 2 CH 3< overset bulletC ( CH 3)3 (B)  overset bulletC( CH 3)3< overset bulletCH ( CH 3)2< overset bulletCH 3< overset bulletCH 2 CH 3 (C)  overset bulletC( CH 3)3< overset bulletCH ( CH 3)2< overset bulletCH 2 CH 3< overset bulletCH 3 (D)  overset bulletCH 3< overset bulletCH 2 CH 3< overset bulletCH ( CH 3)2< overset bulletC ( CH 3)3

Tardigrade Admin · Accepted Answer

As number of electron donating groups (- CH 3) directly linked to carbon atom containing radical or cation increases, stability of free radical also increases. Thus, stability of alkyl radical increases as we proceed from primary to tertiary. The correct order is as follows :

Q. The correct order of stability of alkyl radical is

$C ∙ H (C H_{3})_{2} < C ∙ H_{3} < C ∙ H_{2} C H_{3} < C ∙ (C H_{3})_{3}$

$C ∙ (C H_{3})_{3} < C ∙ H (C H_{3})_{2} < C ∙ H_{3} < C ∙ H_{2} C H_{3}$

$C ∙ (C H_{3})_{3} < C ∙ H (C H_{3})_{2} < C ∙ H_{2} C H_{3} < C ∙ H_{3}$

$C ∙ H_{3} < C ∙ H_{2} C H_{3} < C ∙ H (C H_{3})_{2} < C ∙ (C H_{3})_{3}$

As number of electron donating groups $(- C H_{3})$ directly linked to carbon atom containing radical or cation increases, stability of free radical also increases. Thus, stability of alkyl radical increases as we proceed from primary to tertiary.
The correct order is as follows :

Q. The correct order of stability of alkyl radical is

C∙H(CH3​)2​<C∙H3​<C∙H2​CH3​<C∙(CH3​)3​

C∙(CH3​)3​<C∙H(CH3​)2​<C∙H3​<C∙H2​CH3​

C∙(CH3​)3​<C∙H(CH3​)2​<C∙H2​CH3​<C∙H3​

C∙H3​<C∙H2​CH3​<C∙H(CH3​)2​<C∙(CH3​)3​

As number of electron donating groups (−CH3​) directly linked to carbon atom containing radical or cation increases, stability of free radical also increases. Thus, stability of alkyl radical increases as we proceed from primary to tertiary. The correct order is as follows :

$C ∙ H (C H_{3})_{2} < C ∙ H_{3} < C ∙ H_{2} C H_{3} < C ∙ (C H_{3})_{3}$

$C ∙ (C H_{3})_{3} < C ∙ H (C H_{3})_{2} < C ∙ H_{3} < C ∙ H_{2} C H_{3}$

$C ∙ (C H_{3})_{3} < C ∙ H (C H_{3})_{2} < C ∙ H_{2} C H_{3} < C ∙ H_{3}$

$C ∙ H_{3} < C ∙ H_{2} C H_{3} < C ∙ H (C H_{3})_{2} < C ∙ (C H_{3})_{3}$

As number of electron donating groups $(- C H_{3})$ directly linked to carbon atom containing radical or cation increases, stability of free radical also increases. Thus, stability of alkyl radical increases as we proceed from primary to tertiary.
The correct order is as follows :