(a) The table shows three pairs of monomers that are capable of polymerisation. Complete the table by identifying each type of polymerisation. [Table: Monomer pairs: HOCH2CH2OH and HO2CCH2CO2H; a dicarboxylic acid and a diol, both aromatic; CH3CHCF2 and CH3CHCH2]
- (a)Complete the table by identifying each type of polymerisation. [Table: Monomer pairs: HOCH2CH2OH and HO2CCH2CO2H; 1,4-benzenedicarboxylic acid and 1,4-benzenediol; CH3CHCF2 and CH3CHCH2][1]
- (b)(i)2-aminopropanoic acid, CH3CH(NH2)CO2H, can polymerise under suitable conditions. No other monomer is involved in this reaction. Draw a section of the polymer chain formed including three monomer residues. Clearly identify one repeat unit on your diagram.[3]
- (b)(ii)2-aminopropanoic acid, CH3CH(NH2)CO2H, exists as two stereoisomers. Draw three-dimensional diagrams to show the two stereoisomers of 2-aminopropanoic acid. State the type of stereoisomerism shown.[2]
- (c)(i)The skeletal formula of compound W is shown. [Figure shows the skeletal formula of compound W, an epoxide] When W is mixed with a second compound, called a hardener, a polymerisation reaction occurs, producing a non-solvent-based adhesive. Give the name of this type of non-solvent-based adhesive.[1]
- (c)(ii)The hardener is a diamine. A diamine has an alkyl chain with two amine groups which are not bonded to the same carbon atom. Draw the structural formula of a compound that would make a suitable hardener.[1]
This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] (a) HOCH2CH2OH and HO2CCH2CO2H: condensation
- [1] (a) benzene-1,4-dicarboxylic acid and 1,4-benzenediol: condensation
- [1] (a) CH3CHCF2 and CH3CHCH2: addition
- [1] ALL correct
- [1] (b)(i) amide links displayed correct (NHCO OR CONH)
- [1] (b)(i) three monomers of Ala only
- [1] (b)(i) one repeat unit correctly identified
- [1] (b)(i) continuation bonds (with a polypeptide involving Ala only)
- [3] (b)(i) mark as ✓✓✓
- [1] (b)(ii) 3D, tetrahedral, both isomers of 2-aminopropanoic acid
- [1] (b)(ii) optical
- [1] epoxy resin ALLOW Super Glues
- [1] compound with two amine groups per molecule, amine groups must not be on the same carbon atom e.g. H2NCH2CH2NH2
Write your answer and get it marked
On Oracle Prep you can write or photograph your own answer and have it marked by AI against this mark scheme, with feedback on what you missed.
Sign up free →