Topic 11 Practice Paper: Organic chemistry — question paper

Section A: Multiple-choice questions[10 marks]

Choose one answer for each question. Each question is worth 1 mark.

1. 1

   Which compound is a carboxylic acid?

   1. ACH₃OH
   2. BCH₃COOH
   3. CCH₃COOCH₃
   4. DC₂H₄
   ( )
2. 2

   The separation of petroleum into its useful fractions is carried out by

   1. Afiltration
   2. Bcracking
   3. Cfractional distillation
   4. Dchromatography
   ( )
3. 3

   Which statement about the alkanes is correct?

   1. AThey are saturated hydrocarbons
   2. BThey quickly decolourise aqueous bromine
   3. CThey contain one carbon–carbon double bond
   4. DThey are the main feedstock for poly(ethene)
   ( )
4. 4

   Which fraction leaves the tower at the very bottom and is used for road surfacing?

   1. ARefinery gas
   2. BGasoline fraction
   3. CKerosene fraction
   4. DBitumen
   ( )
5. 5

   Hydrogen is added to ethene industrially to make ethane. The catalyst used is

   1. Anickel
   2. Biron
   3. Cyeast
   4. Dsilica
   ( )
6. 6

   Ethanol burns completely in a good supply of air. The products are

   1. Aethanoic acid and water
   2. Bcarbon monoxide and water
   3. Ccarbon dioxide and water
   4. Dethene and oxygen
   ( )
7. 7

   Ethanoic acid is added to sodium carbonate. Which products form?

   1. ASodium ethanoate and hydrogen only
   2. BSodium hydroxide and carbon dioxide
   3. CSodium chloride and water
   4. DSodium ethanoate, water and carbon dioxide
   ( )
8. 8

   Ethyl ethanoate can be prepared in the laboratory by warming a mixture of

   1. Aethene and steam
   2. Bethanol and ethanoic acid
   3. Cethane and chlorine
   4. Dethanoic acid and sodium hydroxide
   ( )
9. 9

   Which property of the fractions changes as you move up the fractionating column?

   1. AChain length increases
   2. BViscosity increases
   3. CBoiling points decrease
   4. DVolatility decreases
   ( )
10. 10

    Which polymer is a polyester that can be converted back into its monomers and re-polymerised?

    1. APoly(ethene)
    2. BNylon
    3. CProtein
    4. DPET
    ( )

Section B: Structured questions[20 marks]

Answer all questions in the spaces provided.

1. 11

   Two colourless liquids, L and M, are hydrocarbons. Orange-brown aqueous bromine is added to separate samples of each. The colour disappears in M within seconds but persists in L.

   1. (a)

      Identify which liquid is unsaturated and name its homologous series.

      [2]
   2. (b)

      State what happens to the colour of the aqueous bromine in liquid L and explain why.

      [2]
   3. (c)

      Liquid L burns in a limited supply of air. Name the two harmful products that can form.

      [1]
2. 12

   Ethanol is used as a fuel additive and as the solvent in many perfumes and medicines.

   1. (a)

      Write the word equation for the complete combustion of ethanol.

      [1]
   2. (b)

      Describe how ethanol is manufactured from glucose, naming the organism and two essential conditions.

      [3]
   3. (c)

      Name the homologous series of ethanol and give its functional group.

      [1]
3. 13

   Two unbranched molecules with the molecular formula C₄H₈ are drawn by a student: one has the double bond between the first and second carbons, the other between the second and third carbons.

   1. (a)

      Name the two molecules.

      [2]
   2. (b)

      State the term that describes the relationship between two compounds with the same molecular formula but different structures.

      [1]
   3. (c)

      Describe the test, with its result, that shows both molecules are unsaturated.

      [2]
4. 14

   A supermarket replaces some plastic packaging with paper, but still sells drinks in poly(ethene) bottles and clothing made of nylon.

   1. (a)

      Define the terms monomer and polymer.

      [2]
   2. (b)

      Name the type of polymerisation that makes poly(ethene) from ethene.

      [1]
   3. (c)

      State two environmental problems caused by the disposal of plastics.

      [2]