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Which group out of the following group is a chromophone of a dye?

$(a)\;-NH_2 \\ (b)\;-N = O \\(c)\;-COOH \\ (d)\;-SO_3H $
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A chromophone is a group such as nitro $(-NO_2)$ nitrosel, $(-N =O)$ ago $(-N=N -)$, Carbonyl $(>C=O)$etc. is responsible for colour of a substance.
Hence b is the correct answer.
answered Mar 10, 2014 by meena.p
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