Question

Conditions which permit molecule to exhibit resonance

Answer 1

A compound can have resonance structures when it has a lone pair or a double bond on the atom next to a double bond. .... also because they are closer to each other they'll interact and this will allow them to resonate, which allows these pi–bonds to freely rotate over the molecule as a whole instead of getting localized
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Answer 2

Answer:

1) The object must have at least one naturalfrequency of vibration. 2)The object must be drivenby an external vibrating force. 3) The frequency of theexternal vibrating force must match the object's natural frequencyof vibration.