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General Organic Chemistry I: Electronic Effects
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Hyperconjugation
JEE Main level
Single correct option
Difficulty 2 of 3
g1129
The correct order of stability of the free radicals is
A
(
CH
X
3
)
X
3
C
⋅
>
(
CH
X
3
)
X
2
CH
⋅
>
CH
X
3
CH
X
2
⋅
>
CH
X
3
⋅
B
(
CH
X
3
)
X
3
C
⋅
>
CH
X
3
CH
X
2
⋅
>
(
CH
X
3
)
X
2
CH
⋅
>
CH
X
3
⋅
C
CH
X
3
⋅
>
CH
X
3
CH
X
2
⋅
>
(
CH
X
3
)
X
2
CH
⋅
>
(
CH
X
3
)
X
3
C
⋅
D
(
CH
X
3
)
X
2
CH
⋅
>
(
CH
X
3
)
X
3
C
⋅
>
CH
X
3
CH
X
2
⋅
>
CH
X
3
⋅
Answer: A
Alkyl radicals are stabilised by hyperconjugation with alpha C-H bonds (9, 6, 3, 0 alpha H respectively). Hence tertiary > secondary > primary > methyl.
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