Chemistry > A/As Level Mark Scheme > Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters Mark Scheme 1 (All)
Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters Mark Scheme 1
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Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters Mark Scheme 1 Level ALevel ExamBoard OCR Sub-Topic Time Allowed: 86 minutes Score: /71 Percentage: /100 Grade Boundaries: A* A B C D ... E U >85% 77.5% 70% 62.5% 57.5% 45% <45% Booklet Mark Scheme 1 Topic Carbonyl Compounds, Carboxylic Acids, Esters& Polyesters Subject Chemistry Question Answer Mar k Guidanc e 1 (a ) (Relative) solubility (in stationary phase) 1 ALLOW how well the compound dissolves IGNORE retention time AND partition DO NOT ALLOW adsorption OR absorption (b ) (i) Compound BAND M+/molecular ion peak (at m/z) = 124 1 ALLOW Mr = 124 IGNORE compound B because m/z = 124 ALLOW C7H8O + = 124 OR C7H8O2 = 124 2 ALLOW peak at (m/z =) 109 due to HOC6H4O+ ALLOW peak at (m/z =) 109 due to loss of CH3 IGNORE reference to other peaks in the spectrum (ii) Compound (B) is less soluble in the stationary phase/ liquid 1 ORA Answer refers to the first compound to emerge from the column ALLOW compound (B) is more soluble in mobile phase/gas ALLOW compound interacts less with stationary phase/liquidOR compound interacts more with mobile phase/gas IGNORE compound adsorbs less IGNORE compound is not very soluble (comparison needed) IGN [Show More]
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