Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
121–130 of 317 · Easy
Question 121
2 marks · Easy
Answer and see the solution →Draw the displayed (structural) formula of an unbranched alkane with 3 carbon atoms. State the name of this alkane.
Question 122
2 marks · Easy
Answer and see the solution →Explain why the reaction between propane and chlorine in ultraviolet light is called a substitution reaction. Use a chemical equation to support your answer.
Question 123
1 mark · Easy
Answer and see the solution →State the general formula for alkanes.
Question 124
3 marks · Easy
Answer and see the solution →This question is about the unbranched alkane with seven carbon atoms.
(a)[1 mark]Write the name of this alkane.
(b)[1 mark]Give its molecular formula.
(c)[1 mark]Draw its displayed (structural) formula.
Question 125
2 marks · Easy
Answer and see the solution →Pentane () reacts with bromine in ultraviolet light.
(a)[1 mark]Write a balanced chemical equation for the mono-substitution reaction between pentane and bromine.
(b)[1 mark]Name the organic product formed.
Question 126
1 mark · Easy
Answer and see the solution →State the molecular formula of a branched isomer of butene.
Question 127
3 marks · Easy
Answer and see the solution →(a)[1 mark]Name the alkene with three carbon atoms.
(b)[1 mark]Draw the displayed formula of this alkene.
(c)[1 mark]Write the molecular formula of this alkene.
Question 128
2 marks · Easy
Answer and see the solution →An alkene contains 5 carbon atoms per molecule. Calculate the number of hydrogen atoms in a molecule of this alkene.
Question 129
2 marks · Easy
Answer and see the solution →Explain why butene (C4H8) can exist as several different structural isomers.
Question 130
3 marks · Easy
Answer and see the solution →Some alkenes and their number of hydrogen atoms Name Number of carbon atoms Number of hydrogen atoms Ethene 2 4 Propene 3 6 Butene 4 8 (a)[1 mark]State the general formula for alkenes.
(b)[1 mark]Complete the table for pentene.
(c)[1 mark]Explain the pattern in the number of hydrogen atoms as the number of carbon atoms increases in alkenes.