AQA Jan 2012 Paper 4 Q5

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do not write outside the box mass spectrometry is used by organic chemists to help distinguish between different compounds four isomers of c h o shown below were analysed by mass spectrometry ch c o ch ch ch c o ch ch ch ch the mass spectra obtained from these four isomers were labelled in random order as i ii iii and iv each spectrum contained a molecular ion peak at m z the data in the table below show the m z values greater than for the major peaks in each spectrum due to fragmentation of the molecular ion the table also shows where no major peaks occurred spectrum m z values for major peaks no major peak at m z ii iii iv and a two of the molecular ions fragmented to form an ion with m z by losing a radical identify the radical that was lost mark b two of the molecular ions fragmented to form an ion with m z by losing a radical identify the radical that was lost mark wmp jan chem do not write outside the box c three of the molecular ions fragmented to form ions with m z by losing a radical with mr identify two different radicals with mr that could have been lost radical radical marks d consider the structures of the four isomers and the fragmentations indicated in parts a to c write the letter a b c or d in the appropriate box below to identify the compound that produces each spectrum spectrum i spectrum ii spectrum iii spectrum iv marks turn over for the next question turn over wmp jan chem

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