This effect occurs when the electron pair of the pi bond is moved towards the attacking reagent. The +E effect can be observed in the addition of acid to alkenes. The attacking reagent attaches itself to the atom which obtained an electron pair in the transfer. The +E effect is generally observed when the attacking reagent is an electrophile, and the pi electrons are transferred towards the positively charged atom. An example where the +E effect occurs is the protonation of ethene.
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This effect occurs when the electron pair of the pi bond is moved towards the attacking reagent. The +E effect can be observed in the addition of acid to alkenes. The attacking reagent attaches itself to the atom which obtained an electron pair in the transfer. The +E effect is generally observed when the attacking reagent is an electrophile, and the pi electrons are transferred towards the positively charged atom. An example where the +E effect occurs is the protonation of ethene.