Sahiba Naqvi posted an Question
July 03, 2020 • 21:30 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Sir ,plz check the order of stability of the following

2 Answer(s) Answer Now
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    Priyanshu kumar best-answer

    yess sahiba you did it right as always resonance and hyperconjugation if both is there then it is most stable, if only hyperconjugation and only resonance then always resonance delocalisation favours(benzyl,allyl),then at last only hyperconjugation effect..only alpha hydrogen part

    eduncle-logo-app

    sir but in book the answer is different for (1. ) the order is ii>i>iii>v>vi and for (2) ii>iii>vii>iv>i>v>vi

    eduncle-logo-app

    sahiba can you please send me this question.....

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    Priyanshu kumar best-answer

    for free radical know one thing more that both EWG and EDG have a stabilising effect on a radical intermediate....This effect is called Push-pull effect or captodative effect...also resonance also helps in allyl radical ,benzyl radical which stabilises

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    exlpain the captodative effect?

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    Priyanshu kumar

    see some concept you have to keep in mind first of all the stability of free radical which is 3°>2°>1°>methyl, secondly no of Alpha hydrogen more stability more,thirdly when there is pie bond adjacent to free radical then stabilisation occurs which in turns increases stability

    eduncle-logo-app

    plz check my answer if this is correct or not

    eduncle-logo-app

    okk sahiba please tell for stability what concept you apply in all these

    eduncle-logo-app

    why fourth structure get the least stability

    eduncle-logo-app

    only hyperconjugation is there in fourth structure..so least stable and in other four figure resonance is there in addition to some hyperconjugation

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