Is double bond necessary for resonance
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Double bond signifies pi electrons and as the definition of resonance states " it is the delocalisaton of pi electrons in a conjugated system". Hence they are necessary.
Resonance needs pi electrons as well as a conjugated system.
There are 6 types of conjugations .
yash60000:
as I have kept allen booklet in front of me
do they have H+ ions around them ?
They must be canonical structures with anions on a some carbons or hyperconjugation structures
a negative charge,CH2 and NO2 group
I can give you 100% guarantee that no resonance can ever take place with out double bond
Draw it's other structures
You will see a double bond.
yes I think it is canonical structure
Thanks
If you ever have doubts on resonance just see the booklet or check out videos on how to draw them on youtube, they explain really well
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