AQA A2 Chemistry C31 Organic Synthesis And Analysis Kerboodle Answers

This page contains the AQA A2 Organic Synthesis And Analysis Questions and kerboodle answers for revision and understanding .This page also contains the link to the notes and video for the revision of this topic.
 
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C31.1Synthetic routes AQA A2 Chemistry C31 Organic Synthesis And Analysis Kerboodle Answers: Page No. 224

1 a 1-bromobutane to pentanenitrile React with HCN. b React with methanol (with an acid catalyst). c Addition of water (by reaction with concentrated sulfuric acid followed by water). d Dehydrate with P2O5 2 a Add water (by reaction with concentrated sulfuric acid followed by water) to produce ethanol, then oxidise with K2Cr2O7 /H2SO4• b Reduce (using NaBH4• for example) to propan-2-ol, then react with KBr/H2SO4. 3
  • Step 1: Friedel-Crafts acylation using ethanoyl chloride and aluminium chloride.
  • Step 2: Nitration electrophilic substitution using a mixture of concentrated nitric and sulfuric acids.
  • Step 3: Reduction (hydrogenation) using Sn/ concentrated HCI.

31.2 Organic analysis AQA A2 Chemistry C31 Organic Synthesis And Analysis Kerboodle Answers : Page No. 225

1 React with sodium hydroxide, acidify and then add silver nitrate solution. A precipitate will form -white for chlorine, cream for bromine, and pale yellow for iodine. To more clearly distinguish the cream and pale yellow precipitates, add concentrated ammonia -the precipitate will dissolve in the case of bromine, but not in the case of iodine. The white precipitate formed with chlorine will dissolve in aqueous ammonia. 2 a Because OH–ions will form a precipitate with silver nitrate. b Using HCI adds Cl– ions, which will form a precipitate with silver nitrate. 3 a alkene and carboxylic acid b I CH2= CHCOOH c Banner 2

Practice questions: Page No. 226-227

1 (a) (b) (c) 2 (a) 3 4 (a) ( (i) C6H5NO2 (ii) CH3(CH2)2CH3 (iii) CH3COOH (b) (i) Catalyst  (ii) Catalyst (iii) 5
  • acid
  • Add silver nitrate solution
  • If compound A is a chloroalkane a white precipitate of silver chloride would be formed.
6 (a) Aldehyde (b) Propanone 7 Add bromine water to the sample and shake. If a C=C is present the bromine water would decolourise. Banner 3

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