Chemistry 9701 · AS & A Level · Nitrogen compounds

Nitrogen compounds — practice question

Proteins are natural polymers. If one specific protein is partially hydrolysed, the resulting mixture contains tripeptide E.
(a(i))[1]

Describe the conditions that could be used to hydrolyse E so that a mixture of three amino acids is formed.

(a(ii))[2]

Draw the structures of the three amino acids formed in this hydrolysis reaction. Show the three amino acids in the correct form for the conditions you selected in (a)(i).

(b)[3]

If a pure sample of E is obtained in aqueous solution, several kinds of intermolecular force may act between pairs of E molecules. Name three different types of intermolecular force present between pairs of E molecules, and state the groups on the molecules where each force acts.

(c(i))[1]

Polyesters and polyamides are two important types of condensation polymer. Draw the structure of a compound that can polymerise to give a polyamide without requiring a second monomer.

(c(ii))[4]

Draw the structures of two different compounds that can polymerise together to make a polyester with four carbon atoms per repeat unit. Name the two compounds.

Worked solution & mark scheme

This 11-mark question has a full step-by-step worked solution and mark scheme. One marking point: Any correct hydrolysis condition given (e.g. dilute acid, base, enzymes)

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