Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Some chemical reactions of organic compounds
21 practice questions
Practice questions
11–20 of 21
Question 11
3 marks · Normal
Answer and see the solution →An unknown organic reaction is described as: "A bromine molecule is added to an alkene, producing a dibromo compound." Explain, using ideas about reaction types, how you can deduce what type of reaction this is. Refer to the reactants and products in your explanation.
Question 12
4 marks · Normal
Answer and see the solution →The table below shows four reactions of organic compounds.
Table of reactions to classify Equation Reaction 1. CH4 + Cl2 → CH3Cl + HCl 2. C2H4 + H2 → C2H6 3. 2C3H7OH + 9O2 → 6CO2 + 8H2O 4. C2H4 + Br2 → C2H4Br2 (a)[3 marks]For each equation, classify the reaction as substitution, addition, or combustion.
(b)[1 mark]State how you used the equations to identify at least two of the reaction types.
Question 13
1 mark · Normal
Answer and check →Which of the following best describes a substitution reaction in organic chemistry?
- A.A halogen adds to an alkene without removing any atoms.
- B.A hydrogen atom is replaced by a halogen atom in an alkane.
- C.A hydrocarbon burns in oxygen, producing carbon dioxide and water.
- D.An alkene reacts with hydrogen to form an alkane.
Question 14
2 marks · Normal
Answer and see the solution →Complete these sentences about organic reactions: (i) Combustion reactions of organic compounds require the presence of ______. (ii) Addition reactions often involve compounds called ______.
Question 15
4 marks · Normal
Answer and see the solution →Classify the reaction types for the following organic processes and justify your answers.
(a)[2 marks]Ethanol reacts with oxygen to produce carbon dioxide and water.
(b)[2 marks]Ethane reacts with chlorine in the presence of sunlight to form chloroethane and hydrogen chloride.
Question 16
2 marks · Normal
Answer and see the solution →State the type of reaction occurring when but-1-ene reacts with hydrogen gas to form butane. Briefly explain your answer.
Question 17
4 marks · Normal
Answer and see the solution →The following two reactions involve organic compounds:
(a)[2 marks]CH4(g) + Cl2(g) → CH3Cl(g) + HCl(g). State the type of reaction and explain why it is classified as this type.
(b)[2 marks]C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(l). State the type of reaction and explain your answer.
Question 18
3 marks · Normal
Answer and see the solution →Pentane burns completely in oxygen. Write the balanced chemical equation for the complete combustion of pentane ([31m\ce{C5H12}[0m)), and state the type of reaction. Show your working.
Question 19
2 marks · Hard
Answer and see the solution →Butan-2-ol reacts with oxygen to produce carbon dioxide and water. State and explain the type of reaction that occurs.
Question 20
5 marks · Hard
Answer and see the solution →The following reactions involve organic compounds. Answer all parts.
(a)[1 mark]Classify the reaction:
(b)[1 mark]State the reason for your answer in part (a).
(c)[1 mark]Classify the reaction:
(d)[1 mark]State the reason for your answer in part (c).
(e)[1 mark]Classify the reaction: