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  4. The arrangement of (CH3)3C-, (CH3)2CH-, CH3CH2- when attached to benzene or unsaturated group in increasing order of inductive effect is

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Q. The arrangement of $ {{(C{{H}_{3}})}_{3}}C-,\,\,{{(C{{H}_{3}})}_{2}}CH-, $ $ C{{H}_{3}}C{{H}_{2}}- $ when attached to benzene or unsaturated group in increasing order of inductive effect is

Rajasthan PMTRajasthan PMT 2010

Solution:

The inductive effect of the alkyl group on a saturated carbon chain follows the order $ {{(C{{H}_{3}})}_{3}}C->{{(C{{H}_{3}})}_{2}}CH-> $ $ C{{H}_{3}}-C{{H}_{2}}->C{{H}_{3}} $ However, when an alkyl group is attached to an unsaturated system such as double bond or a benzene ring, the order of inductive effect is actually reversed. This effect is called hyper conjugation effect or Baker-Nathan effect. Now, the reactivity order is $ {{(C{{H}_{3}})}_{3}}C-<{{(C{{H}_{3}})}_{2}}CH-