Question

Which of the following statements is CORRECT with regards to the dyeing mechanism of methyl orange:

1. It involves cleavage of the N=N bond of the dye and formation of two new carbon-nitrogen bonds with the fabrics.
2. It involves light-induced 2+2 cyclization of the diazo group in methyl orange with double bonds of the fabrics.
3. It involves π-stacking of the aromatic rings of methyl orange with analogous aromatic moieties of the fabrics.
4. It involves ionic bonding between sulfanilic acid anion and charged group of the fabrics in acidic media.
5. Both B and C mechanisms are involved

Answer 1

The dyeing mechanism of methyl orange involves ionic bonding between sulfanilic acid anion and charged group of the fabrics in acidic media.