OCR A Specimen Paper 2 Q17

Answers available below

18 17 Molecules with more than one functional group are useful chemical building blocks. (a) Compound D, CH3CH(OH)CH2NH2, is an intermediate in the synthesis of a variety of drugs. (i) Compound D can be synthesised from ethanal, CH3CHO. Devise a two-step synthesis of compound D from ethanal.Give details of appropriate reagents and relevant conditions.Write an equation for each step, showing clearly all organic compounds. . . . . .Specimen [4] (ii) Explain why compound D is very soluble in water. Use a diagram in your answer. .[3]OCR 2014 H432/02<br /> 19 (iii) Compound D reacts with propanedioic acid, HOOCCH2COOH, to form a condensation polymer. Draw a possible repeat unit of this condensation polymer. Show clearly any functional group present in the repeat unit. [2] (i) (b) Serine, shown below, is an amino acid. Specimen Use electron repulsion theory to predict the shape of the bonds around atoms A and B. Give relevant bond angles around atoms A and B. Give reasons for your answers. . . . . . . [4] H432/02 Turn overOCR 2014<br /> 20 (ii) A student adds an excess of aqueous sodium hydroxide to a sample of solid serine. The student then purifies the resulting reaction mixture to obtain a pure sample of an ionic organic product.Draw the structure of the ionic organic compound obtained.Outline the steps that the student could carry out to obtain a pure sample of the organic product from the reaction mixture. . . (c) Tabtoxin is a poisonous substance produced by bacteria found in lilac trees. [3] [1] [4] Specimen tabtoxin (i) Identify the chiral centres present in a molecule of tabtoxin. On the structure above, mark each chiral centre with an asterisk, *. (ii) Tabtoxin can be broken down by alkaline hydrolysis. Draw the structures of all the organic products of the alkaline hydrolysis of tabtoxin.OCR 2014 H432/02<br />

Show answer