Question

Alizarin dye contains ......................chromophoric groups
1) >C=N-- 2) =C=O and =C=C 3) >C=NH and >C=N- 4) -N=O, >N—OH​

Answer 1

Answer:

4) -N=O, >N—OH

Explanation:

I hope that this helps you

Answer 2

Alizarin dye contains 4) -N=O, >N—OH chromophoric groups:

• Alizarin is a dye whose molecular formula includes N=O and N—OH groups which are responsible for colour.
• The Chromophoric group is responsible for the colour observed in a molecule.
• The chemical name of alizarin is dihydroxyanthraquinone which is anthracene-9,10-dione.
• It also contains a hydroxyl group on the ring.
• Alizarin is used extensively as a dye. it is red coloured and extracted from roots of the madder plant (Rubia tinctorum).
• Alizarin is a herbal dye and its structure originated from anthraquinone.
• It is highly soluble in hexane.