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Sourav posted an Question
August 31, 2020 • 18:25 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Having doubt btw a and b

Arrange the following compound, in order of C-N bond length. NO2 Me Me Me e Me (B)O oO D) Me (A) -Me NO2 (a) D>C>B>A (6)D> D>C>A>B (c)A>B>C>D ()D>A>C>B

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    Dinesh khalmaniya 1

    hope this will help you 🙏🙏

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    why extended reso not possible

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    im not able to send msg

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    because+H effect works only at o and p position.

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    Hyperconjugation helps in extended reso?

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    yes it just like resonance

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    mean options B have more resonating structure compair to A, because here on methyl group at para position also included in resonance

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    got it?

  • comment-profile-img>
    Dinesh khalmaniya 1 Best Answer

    option B

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    how sir.

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    is it correct??

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    yes

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    remember that more the resonance more is the double bond characters in single bond while more single bond characters in double bond.

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    here C-N bond is single so here we will check double bond characters

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    in option A non of methyl at ortho or para so no extended resonance possible while in B one methyl at para so it increase the resonance so double bond characters increase in C-N bond

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    got it??

  • Suman Kumar

    option A is correct

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    jis carbon se NO2 attached hai use carbon pe del+ kam karna hai

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    jitni del+ positive kam hogi c-n bond stronger

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    answer is B

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