CIE Jun 2013 v3 Paper 2 Q4

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Examiners For Use Compound Q, heptan-2-one, is found in some blue cheeses. CH3(CH2)4COCH3 compound Q (a) Compound Q may be reduced to R. Compound R may be dehydrated to give two different products, S and T. (i) In the boxes below, draw the structural formulae of R, S, and T. CH3(CH2)4COCH3 reduce dehydrate (ii) State the reagents that would be used for each of these reactions in a school or college laboratory. reductiondehydration[5]UCLES 2013 9701/23/M/J/13<br /> Examiners For Use (b) In the boxes below, write the structural formula of the organic compound formed when Q is reacted separately with each reagent under suitable conditions. If you think no reaction occurs, write 'NO REACTION' in the box. Tollens reagent HCN K2Cr2O7 / H+ (c) Therst stage of cheese making is to produce 2-hydroxypropanoic acid (lactic acid) from milk. [3] CH3CH(OH)CO2H lactic acid Other than the use of a pH indicator, what reagent could you use to con rm the presence of some lactic acid in a sample of heptan-2-one? State what observation you would make. reagentobservation[2] [Total: 10]UCLES 2013 9701/23/M/J/13 [Turn over<br />

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