Pearson Edexcel IGCSE · Chemistry

Alkenes: Practice Questions

5 multiple-choice questions marked as you go, and 4 written questions with worked solutions. All on Alkenes.

9 questions21 marksFree, no account

Question 1

1 mark

Alkenes are classified as unsaturated hydrocarbons because they contain:

Question 2

1 mark

Which of the following molecular formulae correctly adheres to the general formula for alkenes, \(C_nH_{2n} \)?

Question 3

1 mark

An alkene has the molecular formula \(C_5H_{10}\). Which of the following is the correct IUPAC name for a branched isomer of this alkene that has its double bond between the first and second carbon atoms of the longest chain?

Question 4

1 mark

When ethene reacts with bromine water, the orange solution becomes colourless. What is the IUPAC name of the organic product formed in this addition reaction?

Question 5

1 mark

A specific isomer of butene (\(C_4H_8\)) reacts with bromine to form 2,3-dibromobutane as the only organic product. What is the IUPAC name of the original alkene isomer used in this reaction?

Question 6

3 marks

State the molecular formula and the name of the unbranched alkene that contains exactly six carbon atoms.

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Question 7

5 marks

A specific alkene molecule is found to contain 10 hydrogen atoms. Determine its molecular formula and its IUPAC name.

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Question 8

3 marks

Describe the color change observed when bromine water is added to an alkene and identify the type of chemical reaction that occurs during this process.

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Question 9

5 marks

Alkenes are unsaturated hydrocarbons that can be distinguished from alkanes through specific chemical tests.
a) State the general formula<\/b> for the alkene homologous series.
b) When ethene (\(C_2H_4\)) is bubbled through bromine water, a reaction occurs. State the color change observed in the bromine water and provide the name of the type of reaction that takes place.
c) Give the IUPAC name and draw the displayed formula<\/b> of the organic product formed when ethene reacts with bromine (\(Br_2\)).<\/p>

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