1.

Which of the following is not a chromophore

Answer»

`-NO_(2)`
`-N = N-`
`-NO`
`-NH_(2)`

Solution :A dye molecule is made up to two different part (i) Chromophore (ii) Auxochrome. The groupswhich produce colour in a compoundi.e., chromophores are usual UNSATURATED groups like nitro, AZO, azoxy, carbonyl and olefinicbonds Auxochrome are usually acidic/basic functional group like -OH, -COOH, `-SO_(3)H, -NH_(2), -NHR, -NR_(2)`.
A compound CONTAINING only a chromophore may be coloured material but not a dye. For example azo BENZENE is red coloured but not a dye. Where as para amino azobenzene (aniline yellow) is a dye.


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