Chemistry In Everyday Life Question 64
Question: Which of the following is not a chromophore
Options:
A) $ -N=N- $
B) $ -NO $
C) $ -NO_2 $
D) $ -NH_2 $
Show Answer
Answer:
Correct Answer: D
Solution:
A dye molecule is made up of two different part (i) Chromophore (ii) Auxochrome. The groups which produce colour in a compound i.e., chromophores are usual unsaturated groups like nitro, nitroso, azo, azoxy, carbonyl and olefinic bonds Auxochrome are usually acidic / basic functional group like $ -OH, $
$ -COOH, $
$ -SO_3H, $
$ -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.
BETA
