The electromeric effect is, temporary effect

Hydrogen ion $$(\mathrm{H}^{+})$$ shows negative electromeric effect

The organic compound shows electromeric effect in the presence of the reagent only.

Electromeric effect dominates over inductive effect

$-\mathrm{CN},-\mathrm{NH}_2,-\mathrm{NHR},-\mathrm{OCH}_3$

$-\mathrm{CN},-\mathrm{CHO},-\mathrm{NHCOCH}_3,-\mathrm{COOR}$

$-\mathrm{NO}_2,-\mathrm{NH}_2,-\mathrm{COOH},-\mathrm{COOR} $

$-\mathrm{NO}_2,-\mathrm{CHO},-\mathrm{SO}_3 \mathrm{H},-\mathrm{COR}$

Phosphorous and halogens only

Nitrogen, Sulphur and Phosphorous only

Nitrogen, Sulphur, phosphorous and halogens

Nitrogen and Sulphur only

$-\mathrm{OH}$

$-\mathrm{OR}$

$-\mathrm{COOH}$

$-\mathrm{NH}_2$