OCR A Jan 2012 Paper 2 Q1

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Answer all the questions. 1 Crude oil is a source of many hydrocarbons. The skeletal formulae of some of these hydrocarbons are shown below. (a) Explain why compound A is both saturated and a hydrocarbon.[2] (b) What is the empirical formula for compound A?[1] (c) Give the letters, A, B, C, D, E, F, G, H or I, of two hydrocarbons that are structural isomers of each other.and[1]OCR 2012<br />
 (d) The petroleum industry processes straight chain alkanes into cyclic hydrocarbons such as A, B and E. (i) Explain why the petroleum industry processes straight chain alkanes into cyclic hydrocarbons.[1] (ii) Hydrocarbon C can be processed into the cyclic hydrocarbon B. Construct an equation for this reaction. [1] (e) Explain why hydrocarbon D has a higher boiling point than hydrocarbon C.[2] (f) Hydrocarbons G and H are stereoisomers of each other. Explain what is meant by the term stereoisomerism.[2] (g) Construct the equation for the complete combustion of hydrocarbon C.[2]OCR 2012 Turn over<br />
 (h) A hydrocarbon molecule, C16H34, is cracked to form an octane molecule and two molecules of but-2-ene. Construct the equation for this reaction.[1] (i) Compound I is 3-methylheptane. It does not contain a functional group. (i) What is meant by the term functional group?[1] (ii) Compound I reacts with chlorine in the presence of ultraviolet radiation to give several structural isomers of C8H17Cl. How many structural isomers could be formed in this reaction?[1] (iii) The mechanism of the reaction involves radicals. What is meant by the term radical ?[1] [Total: 16]OCR 2012<br />

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