The arrangement of ${({C H}_{3})}_{3} C -, {({C H}_{3})}_{2} C H -, {C H}_{3} {C H}_{2} -$ when attached to benzene or unsaturated group in increasing order of activating effect is:

{({C H}_{3})}_{3} C - < {({C H}_{3})}_{2} C H - < {C H}_{3} {C H}_{2} -

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{C H}_{3} {C H}_{2} - < {({C H}_{3})}_{2} C H - < {({C H}_{3})}_{3} C -

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{({C H}_{3})}_{2} C H - < {({C H}_{3})}_{3} C - < {C H}_{3} {C H}_{2} -

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{({C H}_{3})}_{3} C - < {C H}_{3} {C H}_{2} - < {({C H}_{3})}_{2} C H -

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Solution

The correct option is A ${({C H}_{3})}_{3} C - < {({C H}_{3})}_{2} C H - < {C H}_{3} {C H}_{2} -$
The order of increasing activation order is
${({C H}_{3})}_{3} C - < {({C H}_{3})}_{2} C H - < {C H}_{3} {C H}_{2} -$
The greater the number of alkyl groups attached to a positive carbon atom, hyper conjugation increases and thus stability the cation.
As ${({C H}_{3})}_{3} C -$ has more alkyl groups attached it is more stable.

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Similar questions

The arrangement of $(C H_{3})_{3} C -, (C H_{3})_{2} C H -, C H_{3} C H_{2} -$ When attached to a benzene or an unsaturated group in increasing order of inductive effect is:

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(C H_{3})_{3} C -, (C H_{3})_{2} C H -, C H_{3} - C H_{2} -

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The arrangement of (CH3)3C−,(CH3)2CH−,CH3CH2− when attached to benzene or unsaturated group in increasing order of activating effect is:

The arrangement of ${({C H}_{3})}_{3} C -, {({C H}_{3})}_{2} C H -, {C H}_{3} {C H}_{2} -$ when attached to benzene or unsaturated group in increasing order of activating effect is: