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Question

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

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Solution

  • The alkyl groups are electron donating group and they cause +I effect because, H atom bears partial positive charge and C-atom bears partial negative charge which combine effect to donate electrons to a system.
  • Since, a tertiary carbocation is most stable so it will give the most +I effect and so the secondary carbocation and then primary.
  • The greater the number of alkyl groups attached to a positive carbon atom, hyper conjugation increases and thus stability the cation.
  • The order of increasing inductive effect is

CH3CH2<(CH3)2CH<(CH3)3C



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