Auxochromes of dyes are generally called as-

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Colour intensifiers

Colour depressors

A and B

None of the above

answer is A.

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Detailed Solution

Concept: Auxochrome-containing aromatic compounds are dyes. They have a benzene nucleus and a significant amount of pi-electron delocalization. For various structures, delocalization is to varying degrees. Consequently, light with a variety of wavelengths and energy can be absorbed. The energy of the electronic transitions affects how much light is absorbed.
These electronic transitions take place as a result of the chromophore's electrons being excited from their ground state to their excited state. The electrons are activated when a chromophore absorbs light in the visible spectrum. Pi electron delocalization is influenced by chromophores. As a result, the dye may absorb light of various wavelengths.
The colour is unaffected when auxochrome and chromophore are meta to one another. However, when the degree of delocalization grows, the colour is increased if auxochrome and chromophore are ortho or para to one another.
The dye is coloured due to auxochrome.
Hence, the correct answer is option 1.

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