Browse Questions

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

$(a)\;-NH_2 \\ (b)\;-N = O \\(c)\;-COOH \\ (d)\;-SO_3H$

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.