Nivedha posted an Question
August 24, 2020 • 02:15 am 30 points
  • CSIR NET
  • Chemical Sciences

Order of rate of reaction of following compound with phenyl magnesium bromide is: ph-c ph me-c-h me c-me o o o (1) (ii) (iii) ov (b) ii> i>i (a) i> i1>ii (c) ii

Order of rate of reaction of following compound with phenyl magnesium bromide is: Ph-C Ph Me-C-H Me C-Me O O O (1) (II) (III) ov (b) II> I>I (a) I> I1>II (c) III >1 >II (d) II>1>III H TLL

2 Answer(s) Answer Now
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  • Narayanarao gundoju

    more ph more resonance and less electrophilic nature of carbonyl

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    Dinesh khalmaniya 1 best-answer

    Explanation- we know that carbonyl compounds give nucleophilic addition reaction because C=O bond is polara so C gets partial positive and O gets partial negative charge.

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    due to partial positive charge on Carbonyl Carbon it gives nucleophilic addition reaction that means nucleophile attack on carbonyl carbon

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    so more the partial positive charge on carbonyl Carbon, more is the reactivity towards NAR

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    we know that EWG decrease the electron density hence increase the partial positive charge on carbonyl carbon. while ERG decrease the partial positive charge on carbonyl carbon

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    here Ph and CH3 both are ERG and Ph have +R while CH3 hav -I effect

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    we know that +R is more dominant over +I effect so carbonyl having Ph groups have less reactivity than carbonyl having CH3 groups

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    so the option B is correct

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    got it?

  • Narayanarao gundoju

    Due to resonance effect option b

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    due to resonance and hyperconjugation inductive effect

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    Priyanshu kumar Best Answer

    option B is correct

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    Due to less steric crowding the nucleophile attack is easier in IInd compound

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    Got this??

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    please ask nivedha if any doubt in this😊

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