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Sourav posted an Question
September 18, 2020 • 18:33 pm 30 points
  • IIT JAM
  • Chemistry (CY)

Stability order of resonance structures

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    Priyanshu kumar Best Answer

    Ist major...

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    3rd minor

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    2nd one intermediate

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    why sir

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    it is given in module first check for uncharged species then for number of double bonds

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    wait explaining dear sourav

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    see oxygen is more electronegative than nitrogen...so it will hold negative charge in a more better way...so ist is major contributor than 2nd

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    In 3rd there is -2 formal charge...means more charge separation...so minor contributor

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    but sir.. According to this rule given, we should go stepwise na? then first we have to check for no of Covalent bonds na? then EN

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    covalent bond is same ...all have 18 electron too...so you check EN

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    now got sourav..charge separation se 3rd minor ho gya

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    or EN se 1st and 2nd compare kr lo

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    sir charge separation jyada aur kam kaise pata lagega?

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    thumb rule keh sakte ho ise...more formal charge means more charge separation

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    more formal charge se minor kyun hota hai sir?

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    more energy required to separate +2 or -2 than to separate +1 and -1

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    so becomes minor contributor

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