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
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||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