The document discusses the electromeric effect, which is a temporary effect observed in organic compounds containing multiple bonds. It involves the movement of a shared pair of pi-electrons between atoms when attacked by a reagent. The atom receiving the electrons becomes negatively charged while the other becomes positively charged. When the reagent is removed, the compound returns to its original state. The document also explains positive electromeric effect occurs when an electrophile attacks and electrons shift toward the positively charged atom, while negative electromeric effect involves electrons shifting away from a nucleophilic attack.