OCR A Jun 2013 Paper 2 Q7

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The list shows the structural formulae of some halogenoalkanes. 18 N O P Q CF3CFCl2 CH3CH2Br CH3CH2CH2CH2Br CH3CH2CH2CH2I R S T CH3CH2CHClCH3 CH3CHBrCH2CHICH3 (CH3)3CBr (a) Choose from the list above, the letter of the halogenoalkane that is extremely unreactive.[1] (b) Halogenoalkanes react with hot KOH(aq) to make alcohols. (i) Choose from the list above, the letter of the halogenoalkane which reacts with hot KOH(aq) to form a diol (a molecule with two OH groups).[1] (ii) Using the curly arrow model, describe the mechanism of the reaction between CH3CH2CH2CH2Br and hot KOH(aq) to make an alcohol. Include relevant dipoles and the name of the mechanism. name of mechanism[4] (iii) Why is the reaction of P with hot KOH(aq) slower than the reaction of Q with hot KOH(aq)?[1]OCR 2013<br /> (c) Write one equation, using structural formulae, to show how but-2-ene can be converted into one of the listed halogenoalkanes, N, O, P, Q, R, S or T. 19 (d) CFCs were once used as propellants but have now been replaced by biodegradable alternatives. State one type of a biodegradable alternative.[1] [Total: 10] [2]OCR 2013 Turn over<br />

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