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Q.
Which of the following is not a chromophore ?
UP CPMTUP CPMT 2010Chemistry in Everyday Life
Solution:
A dye molecule is made up of two different parts (i) Chromophore (Greek : chroma = colour, phoros - bearing) and (ii) Auxochromes (Greek: auxo - increase, chroma = colour). The groups which produce colour in a compound, i.e., chromophores are usually unsaturated groups like nitro, nitroso, azo, azoxy, carbonyl and olefinic bonds. Auxochromes are usually acidic/basic functional groups like $—OH, —COOH , —SO_{3}H, — NH_{2}, — NHR — NR_{2}$
$\therefore — N = N — , —NO_{2}, —NO$ are chromophores and $—NH_{2}$ is an auxochrome