Arrange the groups $C H_{3^{-}}, C H_{3} C H_{2 -}, {(C H_{3})}_{2} C H$ and ${(C H_{3})}_{3} C -$ in order of electron releasing effect when attached to benzene ring

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${(C H_{3})}_{3} C - > {(C H_{3})}_{2} C H - > C H_{3} C H_{2 -} > C H_{3 -}$

$C H_{3^{-}} > C H_{3} C H_{2^{-}} > {(C H_{3})}_{2} C H - {(C H_{3})}_{3} C -$

$C H_{3} C H_{2^{-}} > C H_{3^{-}} > {(C H_{3})}_{3} C - > {(C H_{3})}_{2} C H -$

${(C H_{3})}_{2} C H - > {(C H_{3})}_{3} C - > C H_{3} - > C H_{3} C H_{2^{-}}$

answer is B.

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Detailed Solution

The effect depends on the number of alpha hydrogen present on the alpha carbon with reference to the benzene ring. More the hydrogens more the plus I and Plus M effect.

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