Answer:-
A pyrylium salt is brightly colored because of its conjugated π-electron system, which allows it to absorb visible light. This system consists of alternating double and single bonds, creating delocalized electrons that interact with light. When light hits the molecule, certain wavelengths are absorbed, while others are reflected, giving the compound its bright color. The exact color depends on the specific structure and substituents attached to the pyrylium ring. These properties make pyrylium salts useful in dyes, sensors, and optical materials where vibrant coloration and light absorption are essential.
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