Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
71–80 of 335 · Normal
Question 71
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 72
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 73
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 74
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 75
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 76
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 77
6 marks · Normal
Answer and see the solution →(a)[2 marks]Draw the displayed formula for propene.
(b)[2 marks]Give the IUPAC name for the compound with the following displayed formula.
Displayed formula for this part (c)[2 marks]State and explain the difference in bonding between the compounds you answered in parts a and b.
Question 78
6 marks · Normal
Answer and see the solution →(a)[3 marks]This is the displayed formula for a compound:
Displayed formula for this part Describe how the atoms are connected and identify the type of bonds present.
(b)[2 marks]Give the systematic (IUPAC) name for this compound.
(c)[1 mark]Suggest one homologous series this compound belongs to and give a reason for your answer.
Question 79
6 marks · Normal
Answer and see the solution →(a)[2 marks]State the typical number of bonds formed by each of the following atoms in an organic molecule: carbon, hydrogen, oxygen.
(b)[2 marks]An alcohol has the molecular formula C3H8O. Using your answer to part a, draw the displayed formula for this alcohol.
(c)[2 marks]Name this alcohol according to IUPAC rules.
Question 80
6 marks · Normal
Answer and see the solution →(a)[2 marks]Butene and butanol are both organic compounds. Draw the displayed formula for butanol.
(b)[2 marks]Explain how you use the structure to identify the correct IUPAC name for butanol.
(c)[2 marks]Describe one key difference in the structure and naming between butene and butanol.