OCR_A level Chemistry_Marking Scheme 1_2020 | SPS F108 12.1_Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters - $10.99   Add to cart

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OCR_A level Chemistry_Marking Scheme 1_2020 | SPS F108 12.1_Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters

SPS F108 12.1_Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters_A level_OCR_Chemistry_Marking Scheme 1 Carbonyl Compounds, Carboxylic Acids, Esters & Polyesters Mark Scheme 1 Level A Level Exam Board 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% Question Answer Mark Guidance 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 B AND 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/liquid OR compound interacts more with mobile phase/gas IGNORE compound adsorbs less IGNORE compound is not very soluble (comparison needed) IGNORE volatility OR reactivity Question Answer Mark Guidance (c) (i) reagent = K2Cr2O7 AND H2SO4  compound C =  ester =  3 ALLOW acidified dichromate ALLOW H+/any acid IGNORE concentration of acid ALLOW Na2Cr2O7 /Cr2O 2- /(potassium OR sodium) 7 dichromate((VI)) - ALLOW acidified MnO4 ALLOW Tollens’ reagent/ammoniacal silver nitrate IGNORE conditions ALLOW correct structural OR displayed OR skeletal formulae OR a combination of above as long as unambiguous ALLOW ECF from incorrect compound C Check positions of OH groups ALLOW esterification of phenol group Question Answer Mark Guidance

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