Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Organic Chemistry
785 practice questions
Topics covered
Practice questions
151–160 of 317 · Easy
Question 151
3 marks · Easy
Answer and see the solution →A student tests samples of pentane and pent-1-ene with bromine water.
(a)[1 mark]State what is observed when bromine water is added to pent-1-ene.
(b)[1 mark]State what is observed when bromine water is added to pentane.
(c)[1 mark]Explain why these observations allow you to distinguish between pentane and pent-1-ene.
Question 152
2 marks · Easy
Answer and see the solution →Write the balanced chemical equation for the addition reaction between propene ( ) and bromine ( ). State the name of the organic product formed.
Question 153
2 marks · Easy
Answer and see the solution →A student tests an unknown hydrocarbon with bromine water. The liquid does not decolourise bromine water. Explain what this result tells you about the type of hydrocarbon and give a reason.
Question 154
3 marks · Easy
Answer and see the solution →A student compares the reaction of different alkenes with bromine water. The results are shown in the table.
Alkene tested Observation with bromine water ethene colourless propene colourless but-1-ene colourless (a)[1 mark]Describe the pattern in the results.
(b)[1 mark]State a conclusion about the reaction between alkenes and bromine water.
(c)[1 mark]Suggest what would happen if pent-1-ene was tested with bromine water.
Question 155
1 mark · Easy
Answer and see the solution →What is the chemical test used to distinguish between an alkane and an alkene?
Question 156
3 marks · Easy
Answer and see the solution →Hept-1-ene is reacted with bromine water.
(a)[1 mark]Write the structural formula of the product formed.
(b)[1 mark]Name the type of reaction that takes place.
(c)[1 mark]State the name of the organic product.
Question 157
2 marks · Easy
Answer and see the solution →A sample of an alkene is tested with bromine water. The orange colour remains. Calculate the number of carbon–carbon double bonds present in one molecule of the alkene and explain your answer.
Question 158
1 mark · Easy
Answer and see the solution →State the product formed when ethene reacts with steam.
Question 159
3 marks · Easy
Answer and see the solution →(a)[1 mark]Write the balanced chemical equation for the hydrogenation of ethene.
(b)[1 mark]Name the product formed in this reaction.
(c)[1 mark]State the type of reaction taking place.
Question 160
2 marks · Easy
Answer and see the solution →Calculate the mass of water needed to react completely with 7.0 g of ethene in the hydration reaction. (M_r of C2H4 = 28, M_r of H2O = 18)