QUESTIONSHEET 1 E/Z (CIS/TRANS) ISOMERISM
QUESTIONSHEET 1 E/Z (CIS/TRANS) ISOMERISM
QUESTIONSHEET 1 E/Z (CIS/TRANS) ISOMERISM
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A2 LevelTOPIC 23 ANSWERS & MARK SCHEMES<strong>QUESTIONSHEET</strong> 19ESTERSa) O O OH – C H – C CH 3– COCH 2CH 2CH 3OCH(CH 3) 2OCH 2CH 3Propyl methanoate Isopropyl methanoate Ethyl ethanoateor 1-methylethyl methanoateOCH 3CH 2– COCH 3Methyl propanoateAward (1) for each formula and (1) for each name if correctly related to formulaMaximum 6 marksb) (i) Compound II is CH 2OHCH 2OH (1)Compound III is CH 3CH 2CH 2COOH (1)(ii) Compound I Ester (1)Compound II Alcohol / diol (1)Compound III Carboxylic acid (1)(iii) Hydrolysis / saponification (1)(iv) Alkaline hydrolysis goes to completion (1)Acidic hydrolysis is reversible / results in an equilibrium mixture (1)∴ yield is higher from alkaline hydrolysis (1)Maximum 2 marksc) Perfumes (1)Solvents / thinners (1)Food flavourings (1)Plasticisers (1)Maximum 3 marks
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