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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
- IIT JAM
- Chemistry (CY)
Stability order of resonance structures
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Priyanshu kumar Best Answer
Ist major...
3rd minor
2nd one intermediate
why sir
it is given in module first check for uncharged species then for number of double bonds
wait explaining dear sourav
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
In 3rd there is -2 formal charge...means more charge separation...so minor contributor
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
covalent bond is same ...all have 18 electron too...so you check EN
now got sourav..charge separation se 3rd minor ho gya
or EN se 1st and 2nd compare kr lo
sir charge separation jyada aur kam kaise pata lagega?
thumb rule keh sakte ho ise...more formal charge means more charge separation
more formal charge se minor kyun hota hai sir?
more energy required to separate +2 or -2 than to separate +1 and -1
so becomes minor contributor