JEE Main 2002 Chemistry question

Arrangement of , , when attached to benzyl or an unsaturated group in increasing order of inductive effect is

(1)(CH_3)_3-C- < (CH_3)_2-CH- < CH_3-CH_2-
(2)CH_3-CH_2- < (CH_3)_2-CH- < (CH_3)_3-C-Correct
(3)(CH_3)_2-CH- < (CH_3)_3-C- < CH_3-CH_2-
(4)(CH_3)_3-C- < CH_3-CH_2- < (CH_3)_2-CH-

Answer: (2)

Solution

Alkyl groups show a +I (electron-releasing) effect that increases with the number of methyl groups attached to the carbon bonded to the rest of the molecule: ethyl (one CH₃) < isopropyl (two CH₃)

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Question ID VK-037939