Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
1–10 of 335 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State the molecular formula and the displayed formula for ethane.
Question 2
4 marks · Normal
Answer and see the solution →Propene is an organic molecule. Use the information to answer the following:
(a)[1 mark]State the molecular formula of propene.
(b)[1 mark]Write the empirical formula of propene.
(c)[2 marks]Draw the displayed formula for propene.
Question 3
3 marks · Normal
Answer and see the solution →A hydrocarbon has an empirical formula of CH2 and a molar mass of 56 g/mol.
Calculate its molecular formula. Show your working.
Question 4
3 marks · Normal
Answer and see the solution →Explain how the displayed and molecular formulae of an organic molecule are different. Use an example in your answer.
Question 5
4 marks · Normal
Answer and see the solution →The table shows some information about four organic compounds.
Some organic compounds. Compound Molecular formula Empirical formula butane C4H10 ethyne C2H2 pentene CH2 cyclopropane CH2 Complete the table. One compound may have more than one possible answer.
Question 6
1 mark · Normal
Answer and check →Which of the following is the correct displayed formula for methane?
- A.H–C≡C–H
- B.H–C–H (with each C bonded to four hydrogens)
- C.H–C–C–H (each C bonded to three H)
- D.CH4 (written as a condensation)
Question 7
2 marks · Normal
Answer and see the solution →Name the type of formula represented by each of the following:
(i) C3H8
(ii)
Question 8
4 marks · Normal
Answer and see the solution →But-2-yne is an organic molecule containing four carbons and a triple bond.
(a)[1 mark]Give the molecular formula for but-2-yne.
(b)[1 mark]Give the empirical formula for but-2-yne.
(c)[2 marks]Draw the displayed formula for but-2-yne.
Question 9
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 10
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.