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4 marksStructure and Formulae

CAPE Chemistry Unit 2 · 2016 · Paper 2 · Question 1(b)(i)

60 cm³ of oxygen were mixed with 10 cm³ of a gaseous hydrocarbon, X, CxHy. After exploding and cooling to room temperature, 40 cm³ of gas were left. On shaking with aqueous sodium hydroxide, 10 cm³ of oxygen remained. Combustion reaction: CxHy + (x + y/4)O2 -> x CO2 + (y/2)H2O.

Calculate the formula of the hydrocarbon, X.

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Other parts of this question

  1. 1(a)Define the term 'structural isomerism'.[1 mark]
  2. 1(b)(ii)Hence, write its displayed formula.[1 mark]
  3. 1(c)(i)Write the name and displayed formula for EACH of the other two alcohols.[2 marks]
  4. 1(c)(ii)When butan-2-ol is heated with phosphoric acid, a mixture of alkenes is produced, one of which exhibits isomerism. Write the names and displayed formulae of…[2 marks]
  5. 1(d)Complete Table 1 by describing simple laboratory tests to distinguish between EACH pair of compounds: CH3CH(OH)CH3 vs CH3CH2CH2OH, and CH3CH(OH)CH3 vs…[5 marks]

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