OCR A Jun 2009 Paper 2 Q7

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In this question, you are asked to suggest structures for several organic compounds. 14 (a) Compounds F, G and H are unbranched alkenes that are isomers, each with a relative molecular mass of 70.0. Compounds F and G are E/Z stereoisomers. Compound H is a structural isomer of compounds F and G. Explain what is meant by the terms structural isomer and stereoisomer. Explain why some alkenes have E/Z isomerism. Analyse this information to suggest possible structures for compounds F, G and H. In your answer you should make clear how each structure fits with the information given above.[11]OCR 2009<br />
 (b) An analytical chemist was provided with a compound J which has an unbranched carbon skeleton. After analysis, the chemist obtained the following results. 15 type of analysis infrared spectroscopy evidence broad absorption at 3350 cm1 percentage composition by mass C, 70.59%; H, 13.72%; O, 15.69% mass spectrometry molecular ion peak at m/z = 102.0 Use this information to suggest all the possible structures for the unbranched compound J. In your answer you should make clear how your explanation is linked to the evidence.[8] [Total: 19]OCR 2009 END OF QUESTION PAPER<br />

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