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Explain the positive and negative electromericeffect? |
Answer» Solution :(i) When an electrophile such as `H^(+)` approaches an alkene molecule, the `pi` electrons are instantaneously shifted to the electrophile and a new BOND is FORMED between carbon and hydrogen.This makes the other carbon electron deficient and hence it acquires a positivecharge.  (ii) When the `pi` electron is transferred towards the attacking REAGENT, it is called positive electromeric `(+E)` effect.  (III) When the `pi` electron is transferred awayfrom the attacking reagent it is called negative electromeric `(-E)` effect.  For example: The attack of `CN^(oplus)` on a carbonyl carbon. 
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