Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Introduction to Organic Chemistry
185 practice questions
Topics covered
- Types of formula for organic molecules19 practice questions
- General formulae18 practice questions
- Displayed formulae19 practice questions
- Naming organic compounds19 practice questions
- Coding for the type of compound19 practice questions
- Coding for branched chains19 practice questions
- Structural isomerism in the alkanes19 practice questions
- A quick introductory look at the alcohols20 practice questions
- Some chemical reactions of organic compounds21 practice questions
Practice questions
71–74 of 74 · Easy
Question 71
5 marks · Easy
Answer and see the solution →The molecule pentane belongs to a homologous series of organic compounds.
(a)[1 mark]State what is meant by a 'homologous series' in organic chemistry.
(b)[1 mark]Give the general formula for the homologous series that pentane belongs to.
(c)[1 mark]Write the molecular formula for pentane.
(d)[2 marks]Draw the displayed formula for pentane.
Question 72
5 marks · Easy
Answer and see the solution →Ethanol and ethene are two different organic compounds.
(a)[1 mark]Name the type of formula shown here for ethanol: CH3CH2OH
(b)[2 marks]Which functional group is present in ethanol and how does it affect its chemical properties?
(c)[2 marks]Write the displayed formula for ethene.
Question 73
5 marks · Easy
Answer and see the solution →A hydrocarbon in the alkane series contains 7 carbon atoms.
(a)[1 mark]Write the general formula for alkanes.
(b)[2 marks]Calculate the molecular formula for this alkane, showing your working.
(c)[2 marks]Draw the structural (condensed) formula for this alkane.
Question 74
5 marks · Easy
Answer and see the solution →Butanoic acid and butanol are both organic molecules with different functional groups.
(a)[1 mark]State the functional group present in butanoic acid.
(b)[1 mark]What type of formula is shown by this representation: CH3CH2CH2COOH?
(c)[2 marks]Explain how the functional group in butanol affects its chemical properties.
(d)[1 mark]Give one similarity and one difference between the general formulae of carboxylic acids and alcohols.