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Solution


Q.

Which among the following is incorrect statement           [2024]
1 Electromeric effect dominates over inductive effect.  
2 The electromeric effect is, temporary effect.  
3 The organic compound shows electromeric effect in the presence of the reagent only.  
4 Hydrogen ion (H+) shows negative electromeric effect.  

Ans.

(4)

Electromeric effect (E) is a temporary effect that involves the complete transfer of a shared pair of electrons to one or the other atom joined by a multiple bond (double or triple).

It occurs only in the presence of an attacking reagent and direction of π electron shift always facilitates the reaction.

Electromeric effect is said to be +E when the displacement of π electrons is towards the attacking reagent and -E when the displacement of π electrons is away from the attacking reagent. H+ shows positive electromeric effect.