Which of the following is not a chromophore ?

Question

Which of the following is not a chromophore ? (A) -N=N- (B) -NO (C) -NO2 (D) -NH2

Tardigrade Admin · Accepted Answer

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

— O H, — COO H, — S O_{3} H, — N H_{2}, — N H R — N R_{2}

∴ — N = N —, — N O_{2}, — NO

are chromophores and

— N H_{2}

is an auxochrome

Q. Which of the following is not a chromophore ?

$- N = N -$

$- NO$

$- N O_{2}$

$- N H_{2}$

Q. Which of the following is not a chromophore ?

−N=N−

−NO

−NO2​

−NH2​

$- N = N -$

$- NO$

$- N O_{2}$

$- N H_{2}$