Reactions of alkenes and alcohols (chemistry only)

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Question 12
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This question is about hydrocarbons. Pentane and pentene are hydrocarbons containing five carbon atoms in each molecule. Pentane is an alkane and pentene is an alkene.

a.

Identify the molecular formula of pentane and pentene from the following options:

  • C5H8\text{C}_5\text{H}_8C5​H8​
  • C5H10\text{C}_5\text{H}_{10}C5​H10​
  • C5H12\text{C}_5\text{H}_{12}C5​H12​
  • C5H14\text{C}_5\text{H}_{14}C5​H14​
[2]
b.

Bromine water is added to separate samples of pentane and pentene. What would be observed when bromine water is added to:

  1. Pentane
  2. Pentene
[2]
c.

Ethane is an alkane and ethene is an alkene. Figure 1 shows the displayed structural formulae of ethane and ethene.

Displayed structural formulae of ethane and ethene

Compare ethane with ethene.

You should refer to:

  • their structure and bonding
  • their reactions.
[6]

Reactions of alkenes and alcohols (chemistry only) Questions

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