(a(i))[1]
In step 2, the only by-product is $\text{HCl}$. Identify the reagent that was used in this step.
(a(ii))[1]
Suggest the reaction type occurring in both step 2 and step 3.
(a(iii))[1]
State the reagents and conditions required for step 3.
(a(iv))[2]
Suggest the structures of the two products formed when A reacts with alkaline aqueous iodine.
(b(i))[1]
Draw one repeat unit structure of Nomex in the box above.
(b(ii))[1]
What type of polymer does Nomex belong to?
(b(iii))[1]
Suggest the by-product produced during step 3.
(b(iv))[1]
Suggest reagents and conditions for step 2.
(b(v))[1]
Suggest how and why the properties of the polymer might change if some of the diamine monomer were replaced with 1,3,5-triaminobenzene.