Edexcel Jan 2012 Paper 4 Q17

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PMT SECTION B Answer ALL the questions. Write your answers in the spaces provided. 17 Two organic compounds, X and Y, both with the molecular formula C4H8O, contain a carbonyl group. (a) Describe what you would see when 2,4-dinitrophenylhydrazine is added to either of these compounds. (1)(b) It is suspected that X is a ketone and Y is an aldehyde. Outline a chemical test you could carry out to confirm this, describing the results in each case. (3)(c) (i) Give the structural formulae of the two possible isomers of Y which are aldehydes. (ii) Name the technique you would use to purify the product of the test with 2,4-dinitrophenylhydrazine. (1) (1)(iii) Other than by spectroscopic techniques, how would you use the purified product to identify compound Y? [Practical details are not required.] (2)(Total for Question 17 = 8 marks) 10 *P39304A01024*<br />

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