Which of the following groups acts as a chromophore?

Step-by-step solution

A chromophore is a functional group or part of a molecule that absorbs specific wavelengths of visible light, imparting color to the compound. They typically contain unsaturated bonds with electrons. Examples of chromophores include the azo group ( - N = N - ), nitro group ( - NO ₂ ), carbonyl group ( > C = O ), and quinonoid rings. Auxochromes are groups that do not produce color themselves but enhance the color-producing ability of a chromophore when attached to it. Examples of auxochromes include - OH , - NH ₂ ,