Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
21–30 of 785
Question 21
3 marks · Easy
Answer and see the solution →(a)[1 mark]What is meant by the term "functional group" in organic chemistry?
(b)[1 mark]State the functional group found in carboxylic acids.
(c)[1 mark]Explain why the functional group is important in a homologous series.
Question 22
2 marks · Easy
Answer and see the solution →An alkene contains 6 carbon atoms. Calculate the number of hydrogen atoms in this molecule. Show your working.
Question 23
2 marks · Easy
Answer and see the solution →Explain how the presence of a functional group allows chemists to predict the chemical behaviour of organic compounds in the same homologous series.
Question 24
1 mark · Easy
Answer and see the solution →State the general formula for the homologous series of alcohols.
Question 25
3 marks · Easy
Answer and see the solution →(a)[1 mark]State what is meant by a functional group.
(b)[1 mark]Name the functional group present in all alkenes.
(c)[1 mark]Explain how the functional group affects the chemical properties of the compounds in a homologous series.
Question 26
2 marks · Easy
Answer and see the solution →The general formula for alkanes is .
An alkane molecule contains 5 carbon atoms.
Calculate the number of hydrogen atoms in this molecule. Show your working.
Question 27
2 marks · Normal
Answer and see the solution →State what is meant by a homologous series. Give one feature that all members of a homologous series share.
Question 28
4 marks · Normal
Answer and see the solution →The alcohol homologous series contains several compounds.
(a)[1 mark]State the name of the functional group found in all alcohols.
(b)[2 marks]Explain what is meant by the term 'functional group'.
(c)[1 mark]Give the general formula for alcohols.
Question 29
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 30
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.