CIE Jun 2014 v2 Paper 2 Q5

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A hydrocarbon, P, with the formula C6H12 readily decolourises bromine. PMT On reaction with hot, concentrated, acidi ed potassium manganate(VII) solution a single organic product, Q, is obtained. Q gives an orange precipitate when reacted with 2,4-dinitrophenylhydrazine, 2,4-DNPH reagent, but has no reaction with Tollens reagent. (a) (i) Explain these observations.[4] (ii) Draw the skeletal formula of P and give its name. name of P[2] (iii) Draw the skeletal formula of Q and give its name. name of Q[2]UCLES 2014 9701/22/M/J/14<br /> (b) There are several structural isomers of P that also decolourise bromine, but only four of these structural isomers exhibit geometrical (cis-trans) isomerism. Give the structures of any three structural isomers of P that exhibit geometrical (cis-trans) isomerism. PMT [3] [Total: 11]UCLES 2014 9701/22/M/J/14 [Turn over<br />

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