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Question

Which of the following is the correct decreasing order of the stability using concept of inductive effect?
(i) CH3+CHCH2OCH3
(ii) CH3+CHCH2CH3
(iii) CH3+CHO||CCH3

A
(iii)>(i)>(ii)
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B
(i)>(ii)>(iii)
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C
(iii)>(ii)>(i)
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D
(ii)>(i)>(iii)
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Solution

The correct option is D (ii)>(i)>(iii)
Electron donating group stabilises the positive charge by pushing electrons toward positive charge and electron withdrawing group destabilises the positive charge by attracting electrons toward itself.
CH2CH3 is electron donating group

OCH3 is an electron withdrawing group and O||CCH3 is an electron withdrawing group.
among both -I effect order O||CCH3>OCH3>CH2CH3

Hence, the correct order of stability is -
CH3+CHCH2CH3>CH3+CHCH2OCH3>CH3+CHO||CCH3

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