page 05 8. Which of the following is an isomer of pentan-3-ol? A CH3CH2CH(OH)CH2CH3 B CH3CHCHCH2CH2OH C CH3CHCHCH(OH)CH3 D CH3CH(CH3)CH2CH2OH 9. Oxidation of 4-methylpentan-2-ol to the corresponding ketone results in the alcohol A losing 2 g per mole B gaining 2 g per mole C losing 16 g per mole D gaining 16 g per mole. 10. Essential amino acids are defined as the amino acids which A are necessary for building proteins B humans must acquire through their diet C plants cannot synthesise for themselves D are produced when any protein is hydrolysed. 11. A mixture of carbon monoxide and hydrogen can be converted into water and a mixture of hydrocarbons. n CO  +  (2n + 1) H2  ↓  n H2O  +  hydrocarbons What is the general formula for the hydrocarbons produced? A CnH2n−2 B CnH2n C CnH2n+1 D CnH2n+2 12. A mixture of sodium chloride and sodium sulfate is known to contain 0∙6 mol of chloride ions and 0∙2 mol of sulfate ions. How many moles of sodium ions are present? A 0∙4 B 0∙5 C 0∙8 D 1∙0 [Turn over