OCR A Jun 2015 Paper 2 Q1

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Answer all the questions. This question is about different alkanes present in crude oil. (a) Compound A, shown below, is one of the structural isomers of C7H16. (i) What is meant by the term structural isomers? Compound A[1] (ii) Name compound A.[1] (b) The structural isomers of C5H12 have different boiling points. Draw the skeletal formula of the structural isomer of C5H12 with the highest boiling point. (c) A molecule of an alkane has 24 carbon atoms. State the empirical formulae of this alkane.[1] [1]OCR 2015<br />
 (d) Alkanes are used as fuels. (i) Construct an equation for the complete combustion of octane C8H18.[1] (ii) Combustion of 36.48 g of octane produced 2.50 mol of carbon dioxide. Show that this combustion was incomplete. [2] (e) Alkanes in crude oil can be used to manufacture ethene. Two stages are required. (i) Name the two stages.[1] (ii) Write an equation for the preparation of ethene from an alkane.[1] [Total: 9]OCR 2015 Turn over<br />

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