Which of the following is correct with respect to Mesomeric effect?
It operates in unsaturated conjugated compounds
In Mesomeric effect, the sum of lone pairs and bond pairs remains constant
It involves delocalisation of electrons
It is distance dependant
As we have learnt,
Mesomeric effect is not distance dependant. It depends on the extent of Conjugation.
Inductive effect on the other hand is distance dependant.
Hence, the answer is Option (4)
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