Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
51–60 of 317 · Easy
Question 51
2 marks · Easy
Answer and see the solution →Explain why it is not possible to convert one structural isomer of pentane directly into another simply by rotating bonds.
Question 52
3 marks · Easy
Answer and see the solution →The table shows the number of isomers for selected alkanes.
Alkane Molecular formula Number of isomers Methane CH4 1 Ethane C2H6 1 Propane C3H8 1 Pentane C5H12 3 (a)[1 mark]Describe the trend in the number of isomers as the number of carbon atoms increases.
(b)[2 marks]Suggest why methane, ethane, and propane each have only one isomer.
Question 53
1 mark · Easy
Answer and see the solution →Give the molecular formula for the straight-chain alkane with five carbon atoms.
Question 54
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the molecular formula for hexane.
(b)[2 marks]Explain what makes two different hexane molecules structural isomers.
Question 55
2 marks · Easy
Answer and see the solution →How many carbon atoms are present in the alkane with the molecular formula C8H18?
Question 56
1 mark · Easy
Answer and see the solution →State the name of the functional group that all alcohols contain.
Question 57
3 marks · Easy
Answer and see the solution →The diagram below represents an organic compound.
(a)[1 mark]State the homologous series to which this compound belongs.
(b)[1 mark]Name the functional group found in this compound.
(c)[1 mark]Give the displayed formula of the functional group.
Question 58
2 marks · Easy
Answer and see the solution →The compound propanol is an alcohol. Use the information provided to name its homologous series and explain which part of its name identifies it as an alcohol.
Question 59
2 marks · Easy
Answer and see the solution →Explain why all alcohols have similar chemical properties. Refer to their functional group in your answer.
Question 60
3 marks · Easy
Answer and see the solution →The following table lists several organic compounds:
Compound Name Alcohol? (Yes/No) Suffix in Name Ethanol Butanol Butane Propanol Complete the table by: (i) Ticking Yes or No to show if each compound is an alcohol. (ii) Writing the suffix in the name that shows the compound is an alcohol.