Which of the following is not a chromophore?

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Question

(D) dye molecule is made up of two different parts: $(i)$ Chromophore $(ii)$ Auxochrome.The groups which produce colour in a compound,i.e.,chromophore

Vedclass · Accepted Answer

$-NH_2$

Vedclass · Answer

(D) dye molecule is made up of two different parts: $(i)$ Chromophore $(ii)$ Auxochrome.The groups which produce colour in a compound,i.e.,chromophores,are usually unsaturated groups like nitro $(-NO_2)$,nitroso $(-NO)$,azo $(-N=N-)$,azoxy,carbonyl,and olefinic bonds.Auxochromes are usually acidic or basic functional groups like $-OH$,$-COOH$,$-SO_3H$,$-NH_2$,$-NHR$,and $-NR_2$,which deepen or modify the colour of a chromophore.Therefore,$-NH_2$ is an auxochrome,not a chromophore.

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