Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
1–10 of 133 · Hard
Question 1
2 marks · Hard
Answer and see the solution →The displayed formula of a molecule is shown below.
Write the molecular formula and the empirical formula of this molecule.
(a)[1 mark]Molecular formula:
(b)[1 mark]Empirical formula:
Question 2
5 marks · Hard
Answer and see the solution →A student investigates three hydrocarbons and records the following information:
Name Type of formula Formula methane displayed H–C–H (each C bonded to four H) butene molecular C4H8 hexane empirical CH3 (a)[1 mark]Give the molecular formula of methane.
(b)[2 marks]Draw the displayed formula of butene.
(c)[1 mark]Write the molecular formula of hexane.
(d)[1 mark]State the type of formula for 'C4H8'.
Question 3
2 marks · Hard
Answer and see the solution →A student writes the formula C5H12 for an organic compound.
State the type of formula this is and explain what information it gives about the compound.
(a)[1 mark]Type of formula:
(b)[1 mark]Explanation:
Question 4
2 marks · Hard
Answer and see the solution →State what is meant by the term 'functional group' in organic chemistry. Explain why functional groups are important when studying homologous series.
Question 5
5 marks · Hard
Answer and see the solution →Table 1 shows three members of a homologous series.
Table 1 Name Molecular formula Methanoic acid CH2O2 Ethanoic acid C2H4O2 Propanoic acid C3H6O2 (a)[1 mark]State the general formula for this homologous series.
(b)[1 mark]Name the functional group found in all members of this homologous series.
(c)[1 mark]Give one feature, other than the general formula, that all members of a homologous series share.
(d)[2 marks]Explain why the compounds in this series have similar chemical properties.
Question 6
2 marks · Hard
Answer and see the solution →Describe, with an example, what is meant by a functional group in organic chemistry.
Question 7
2 marks · Hard
Answer and see the solution →Figure 1 shows the displayed formula of an organic molecule containing three carbon atoms.
Displayed formula of an organic molecule Describe how you can use this displayed formula to: (i) identify the connectivity (how atoms are joined together) and (ii) determine the types of bonds present in the molecule.
Question 8
5 marks · Hard
Answer and see the solution →Answer the following questions about typical bonding in displayed formulae of organic compounds.
(a)[1 mark]State the typical number of bonds formed by a carbon atom in a displayed formula.
(b)[1 mark]State the typical number of bonds formed by a hydrogen atom in a displayed formula.
(c)[1 mark]State the typical number of bonds formed by an oxygen atom in a displayed formula.
(d)[1 mark]State the typical number of bonds formed by a halogen atom (such as chlorine) in a displayed formula.
(e)[1 mark]Explain why a carbon atom in organic molecules always forms this number of bonds.
Question 9
2 marks · Hard
Answer and see the solution →Draw the displayed formula for ethene ([LaTeX][\ce{C2H4}]).
Question 10
2 marks · Hard
Answer and see the solution →The condensed structural formula of a hydrocarbon is given below:
State the IUPAC name for this compound.