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Question

Which of the following(s) is/are an examples of E effect?

A
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B
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C
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D
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Solution

The correct option is D
Electromeric effect is an temporary effect, it is observed only in presence of attacking reagent. This involves the shifting of π in the mutiple bond.
When the πelectrons of the multiple bond are transferred to the atom to which the reagent gets attached, it is called positive electromeric effect (+E).
When the πelectrons of the multiple bond are transferred to the atom to which the reagent does not get attached, it is called negative electromeric effect (-E).
In (a) and (c), the πelectrons of the double bond is transferred to H+and Br+. Hence, these reaction shows +E effect.
In (b) and (d), the πelectrons of the double bond is transferred to oxygen atom which is not the attacking reagent here. So (b) and (d) show -E effect.
Therefore, answer is option (b) and (d).


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