Shristy posted an Question
July 23, 2020 • 03:52 am 30 points
  • IIT JAM
  • Chemistry (CY)

The decreasing order of the reactivity of the following compounds towards electrophilesis: [gate 2010] (ii) (a) ii>i> li (b) ii > iii >i (c) iii > i> ii (d) i>

The decreasing order of the reactivity of the following compounds towards electrophilesis: [GATE 2010] (II) (a) II>I> lI (b) II > III >I (C) III > I> II (d) I> II>

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    Priyanshu kumar Best Answer

    hope this much helps u shristy😊🙏

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    Priyanshu kumar

    option D is correct...as pyrrole is most reactive towards electrophiles

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    Pyrole is most reactive towards the electrophiles because in this case it is carrying one lone pair of electron .and it is attached with one hydrogen atom, resulting less resonance stabilize than that of pyridine one the another hand thiophene is more reactive because it's carry 2 lone pair of electrons at last pyrole is more reactive than thiophene because nitrogen is smaller in size than that of sulphur so the availability of electrons cloud is maximum than sulphur . consequently it is highly reactive towards electrophiles

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    got shristy??

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    please accept the answer if it helps u shristy 🙏😊

  • Suman Kumar

    option D is correct

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    Pyrrole is most reactive as lone pair of Nitrogen activate the ring towards electrophilic substitution.

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    In thiopene due to extended delocalization with d-orbital of Sulphur it acts as Eletron withdrawing group. So thiopene is less eletron rich.

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    And you already know pyridine is less reactive towards electrophile as the nitrogen present acts as Eletron withdrawing group. See pyridine resonance structure. +ve is generated.

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    See pyrrole resonance structure. -ve is generated. Eletrophile love -ve

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