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 an unsaturated group in increasing order of inductive 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})_{4} 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 $(C H_{3})_{3} C - < (C H_{3})_{2} C H - < C H_{3} C H_{2} -$
In general greater the number of alkyl groups attached to a positively charged $C$ -atoms, the greater is the hyperconjugation interaction and stabilization of the cation.
Hyperconjugation effect increases in the order,
$(C H_{3}) C - < {(C H_{3})}_{2} C H - < C H_{3} C H_{2} - .$
Hence, ans is $A .$

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