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C25.1 Naming organic compounds AQA A2 Chemistry Nomenclature And isorism Kerboodle Answers: Page No. 146

1 a b 2,4-dimethylpentane. 2 a CH₃CH₂CH₂OH Propan-1-ol b CH₃CH(Cl)CH₃ 2-chloropropane c CH₃CH₂CH= CHCH₂CH₃ Hhex-3-ene d CH₃CH₂OH Ethanol e C₄H₉COOH? Pentanoic acid

25.2 Optical isomerism AQA A2 Chemistry Nomenclature And isorism Kerboodle Answers : Page No. 149

1 B 2 3

25.3 Synthesis of optically active compounds AQA A2 Chemistry Nomenclature And isorism Kerboodle Answers : Page No. 153

1 a 2-hydroxybutanoic acid b Yes, the carbon to which the -OH group is bonded has four different groups attached to it. 2 a 2-methyl-2-hydroxypropanoic acid

No, it has no carbon to which four different groups are attached. 3 This carbon atom does not have four different groups attached to it. Banner 2

Practice questions: Page No.

1 2–aminopropanoic acid or 2–aminopropionic acid 2 Optically inactive OR Equal mixture of enantiomers / optical isomers Planar carbonyl group (stated or drawn) Attack from above or below (either side) 3 (a) Optical Equal mixture of enantiomers Plane polarised light Rotated in opposite/different directions (b) Carbocation Planar Attack from either side equally likely 4 (a) 2-methylbutan-1-ol (b) Optical (c) 5 (a) Same molecular formula and same structure but atoms are arranged differently in space. (b) No free rotation about the C=C pent-2-ene (c) 2-hydroxypropanoic acid Optical (d) Plane Polarised light. Rotated by the same amount in opposite directions. Banner 3

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