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Question
Which of the following is the correct decreasing order of the stability using concept of inductive effect?
(i) CH3−+CH−CH2−OCH3
(ii) CH3−+CH−CH2−CH3
(iii) CH3−+CH−O||C−CH3
Which of the following is the correct decreasing order of the stability using concept of inductive effect?
(i) CH3−+CH−CH2−OCH3
(ii) CH3−+CH−CH2−CH3
(iii) CH3−+CH−O||C−CH3
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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||C−CH3 is an electron withdrawing group.
among both -I effect order −O||C−CH3>−OCH3>−CH2CH3
Hence, the correct order of stability is -
CH3−+CH−CH2−CH3>CH3−+CH−CH2−OCH3>CH3−+CH−O||C−CH3
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||C−CH3 is an electron withdrawing group.
among both -I effect order −O||C−CH3>−OCH3>−CH2CH3
Hence, the correct order of stability is -
CH3−+CH−CH2−CH3>CH3−+CH−CH2−OCH3>CH3−+CH−O||C−CH3
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