(Not Double Science - Chemistry iGCSE Only)

Q1-2  Alkanes and alkenes both react with halogens under different conditions.

1. The condition required for methane to react with bromine water is …
  • A.   pressure
  • B.   ultraviolet light
  • C.   catalyst
  • D.   heat

2. The equation for the reaction between propane and chlorine is ..

  • A.   C3H6 + Cl2   C3H5Cl + HCl
  • B.   C3H6 + Cl2   C3H6Cl2  
  • C.   C3H8 + Cl2   C3H6Cl2 + H2
  • D.   C3H8 + Cl2   C3H7Cl + HCl

3. Isomers are molecules with …..

  the same …. but different ….
A Molecular formula Empirical formula
B Molecular formula Structural formula
C General formula Empirical formula
D General formula Structural formula


4. The diagram shows the formula of a molecule found in crude oil.

crude oli molecule

Which hydrocarbon is an isomer of this compound?

  • A.   propane
  • B.   butane
  • C.   pentane
  • D.   hexane

5. The hydrocarbon C4H8 belongs to the homologous series of alkenes and has several isomers. The formula for one of these isomers is:



Another isomer of C4H8 which belongs to the same homologous series is:

C4H8 isomers x4

6. CH3OH, C2H5OH and C3H7OH are the first three members of the alcohol family.  Deduce the general formula for the family of alcohols:

  • A.   CnH2n-1OH
  • B.   CnH2nOH
  • C.   CnH2n+1OH
  • D.   CnH2n+2OH

7. Glucose can be fermented both in the presence and in the absence of air producing different products. Select the main organic product produced in each case:

  In the presence of air In the absence of air
A ethanol Ethanoic acid
B ethanol ethene
C Ethanoic acid ethanol
D Ethanoic acid ethene

Q8-9: Ethanol is oxidized to compound Y when heated with potassium dichromate(VI) in dilute sulfuric acid.

8. The name of compound Y is …
  • A.   carbon dioxide
  • B.   ethene
  • C.   ethyl ethanoate
  • D.   ethanoic acid
9. The colour change in the potassium dichromate(VI) during this reaction is …
  • A.   from orange to colourless
  • B.   from orange to green
  • C.   from green to colourless
  • D.   from green to orange

10. Ethanoic acid is a member of the homologous series of carboxylic acids. The structural formula and empirical formula of the fourth member of this series is …

  Structural formula Empirical formula