A-LevelChemistryHydrocarbonsMay/June 2013Paper 1 Q211 Mark
Sorbic acid is used as a food preservative because it kills fungi and moulds. [Figure 21.1] Sorbic acid will react with • hydrogen in the presence of a nickel catalyst, • bromine in an organic solvent. How many moles of hydrogen and of bromine will be incorporated into one mole of sorbic acid by these reactions? [Figure 21.2]
Amoles of hydrogen: 2, moles of bromine: 2
Bmoles of hydrogen: 2, moles of bromine: 2½
Cmoles of hydrogen: 3, moles of bromine: 2
Dmoles of hydrogen: 3, moles of bromine: 2½
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