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6.2 Organic chemistry

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Question 36

A manufacturer needs to make a condensation polymer containing amide links.

The table shows the molecules present in three mixtures.

MixtureMolecules present
KHOCH2CH2CH2OH\mathrm{HOCH_2CH_2CH_2OH}HOCH2​CH2​CH2​OH and HOOCCH2CH2COOH\mathrm{HOOCCH_2CH_2COOH}HOOCCH2​CH2​COOH
LH2NCH2CH2CH2NH2\mathrm{H_2NCH_2CH_2CH_2NH_2}H2​NCH2​CH2​CH2​NH2​ and CH3CH2COOH\mathrm{CH_3CH_2COOH}CH3​CH2​COOH
MH2NCH2CH2CH2NH2\mathrm{H_2NCH_2CH_2CH_2NH_2}H2​NCH2​CH2​CH2​NH2​ and HOOCCH2CH2COOH\mathrm{HOOCCH_2CH_2COOH}HOOCCH2​CH2​COOH

Which mixture should the manufacturer use? Explain why only this mixture can form the required long-chain polymer and predict the small molecule released.

[5]
Markscheme

6.2 Organic chemistry Questions

  1. GCSE
  2. /Chemistry
  3. /6.2 Organic chemistry

131 exam-style questions on OCR GCSE Chemistry 6.2 Organic chemistry, covering 6.2.1 Crude oil and fractional distillation, 6.2.2 Cracking and dependence on hydrocarbons, 6.2.3 Functional groups and homologous series, 6.2.4 Reactions of alkanes, alkenes and alcohols, 6.2.5 Addition polymerisation and repeat units, 6.2.6 Naturally occurring polymers, 6.2.7 Chemical cells and fuel cells, and 6.2.8 Condensation polymerisation and how to make one. Each one has a worked solution and a mark scheme showing where the marks go.

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