Chemistry 9701 · AS & A Level · Nitrogen compounds
Nitrogen compounds — practice question
Sunset Yellow is a yellow colourant used in food and beverages, and it can be prepared by the route below. During step 3 of the synthesis, the phenol-like compound, S, reacts with intermediate T, which is prepared from amine R. Assume that the $-\text{SO}_3^-\,\text{Na}^+$ group does not react.
(a(i))[3]
Suggest structures for compounds R, S and T, and draw them in the boxes above.
(a(ii))[3]
Suggest suitable reagents and conditions for step 1, and for step 2.
(a(iii))[1]
What kind of organic salt is produced in step 2?
(b(i))[2]
Compound W has the structure shown below. How many $\sigma$ and $\pi$ bonds are there in one molecule of W?
(b(ii))[3]
The products from W reacting with cold HCl and with $\text{CH}_3\text{CH}_2\text{Br}$ dissolve in water but not in organic solvents. Complete the table for these reactions of W.
Worked solution & mark scheme
This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Accurate structures of dyes R, T and S” …