A_Level_Chemistry_A_H432_Q2_MS.

breviations, annotations and conventions used in the detailed Mark Scheme (to include abbreviations and subject-specific conventions). Annotation Meaning DO NOT ALLOW Answers which are not worthy of credit IGNORE Statements which are irrelevant ALLOW Answers that can be accepted ( ) Words which are not essential to gain credit __ Underlined words must be present in answer to score a mark ECF Error carried forward AW Alternative wording ORA Or reverse argument H432/02 Mark Scheme November 2020 6 SECTION A Question Answer Marks AO element Guidance 1 A 1 1.2 2 B 1 1.1 3 A 1 1.1 4 C 1 2.3 5 D 1 1.2 6 D 1 2.1 7 A 1 1.1 8 C 1 2.2 9 D 1 1.2 10 C 1 2.5 ALLOW 5 11 A 1 2.6 12 A 1 2.2 13 A 1 1.1 14 B 1 2.3 15 C 1 1.2 H432/02 Mark Scheme November 2020 SECTION B Question Answer Marks AO element Guidance 16 (a) (i) 2-bromo-3,3-dimethylbutane  1 1.2 IGNORE lack of hyphens or addition of commas ALLOW 3,3-dimethyl-2-bromobutane DO NOT ALLOW 2-bromo-3-dimethylbutane 2,2-dimethyl-3-bromobutane methy for methyl methly for methyl brom for bromo (b) (i) Stereoisomers Same structural formula AND Different arrangement (of atoms) in space OR different spatial arrangement (of atoms) AND Type: Optical  1 1.2 ALLOW structure/displayed/skeletal formula DO NOT ALLOW same empirical formula OR same general formula IGNORE same molecular formula IGNORE references to chiral molecules/compound