The class of polymers called polycarbonates are made by the reaction of carbonyl dichloride, COCl₂, with a diol. a diol n HOROH + n COCl₂ → a polycarbonate [Polymer structure] + 2nHCl Nalgene® is a polycarbonate formed from the diol P and COCl₂. P [Structure of diol P]

1. (a)(i)Deduce the type of polymerisation shown here.[1]
2. (a)(ii)Draw one repeat unit of Nalgene®.[1]
3. (a)(iii)Nalgene® is a strong and tough polymer. Identify two types of intermolecular force that are responsible for these properties of Nalgene®. 1 2[1]
4. (b)Proteins are polymers of amino acids. Complete the table to show how the secondary and tertiary structures of proteins are stabilised. one intermolecular force responsible groups involved secondary structure tertiary structure[2]
5. (c)Explain the significance of hydrogen bonding in DNA in relation to the accurate replication of genetic information.[2]
6. (d)Many polymers are degradable. State two different processes by which some polymers can be degraded.[1]
7. (e)(i)Draw the structures of the two other organic products formed.[2]
8. (e)(ii)Using the 3-letter abbreviations for the amino acids as given in the Data Booklet, complete the sequence for the cyclic peptide, B. [Circular diagram with one "Thr" label][1]
9. (e)(iii)Name two analytical techniques that could be used to separate these amino acids. and[1]

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