Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
11–20 of 335 · Normal
Question 11
3 marks · Normal
Answer and see the solution →An alkane molecule has 8 carbon atoms. Use the general formula to calculate the number of hydrogen atoms in this molecule. Show your working.
Question 12
3 marks · Normal
Answer and see the solution →An alkene and an alkane both contain 4 carbon atoms. Explain why they have different chemical properties. Refer to functional groups in your answer.
Question 13
4 marks · Normal
Answer and see the solution →The table shows the first four members of the alkene homologous series:
Name Formula Ethene C2H4 Propene C3H6 Butene C4H8 Pentene C5H10 (a)[1 mark]State the general formula for alkenes.
(b)[1 mark]Name the next member of this series.
(c)[1 mark]Give the molecular formula for hexene, the sixth member of the series.
(d)[1 mark]Explain the pattern you see in the number of hydrogen atoms for each new member of the series.
Question 14
1 mark · Normal
Answer and check →Which of the following best describes a functional group in organic chemistry?
- A.A group of atoms that determines the chemical properties of a compound
- B.A compound that contains carbon and hydrogen atoms
- C.A general formula that shows the ratio of elements
- D.The number of carbon atoms in a homologous series
Question 15
2 marks · Normal
Answer and see the solution →Give the general formula for alkanes and state the formula for butane.
Question 16
4 marks · Normal
Answer and see the solution →Each member of a homologous series contains the same functional group. The alcohol series contains the functional group –OH.
(a)[2 marks]Describe, with an example, what is meant by a functional group.
(b)[2 marks]Explain why all alcohols undergo similar chemical reactions.
Question 17
2 marks · Normal
Answer and see the solution →Draw the displayed formula for ethene (C2H4).
Question 18
4 marks · Normal
Answer and see the solution →The displayed formula of a molecule is shown below:
(a)[1 mark]State the total number of carbon, hydrogen and oxygen atoms present in the molecule.
(b)[1 mark]Identify the functional group present in this molecule.
(c)[1 mark]Describe the connectivity of the oxygen atom in this molecule.
(d)[1 mark]State the types of bonds present between the carbon atoms and the oxygen atom in this displayed formula.
Question 19
3 marks · Normal
Answer and see the solution →Methanol is a simple alcohol. Using your knowledge of typical bonding, calculate the total number of bonds present in a molecule of methanol ().
Question 20
3 marks · Normal
Answer and see the solution →Explain why alkanes with four or fewer carbon atoms can be represented with straight-chain displayed formulae, and why each carbon has four bonds.