Alkenes

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6 Terms

1
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What is the functional group of alkenes

C=C (carbon carbon double bond)

2
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What is the general formula for alkenes?

CnH2n

3
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Why are alkenes classified as unsaturated hydrocarbons?

They contain one or more C=C double bonds

4
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What are the first four alkenes?

  • Ethene

  • Propene

  • Butene

  • Pentene

5
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Describe the reactions of alkenes with bromine to produce dibromoalkanes and what type of reaction it is.

  • Addition reaction

alkene + bromine —> dibromoalkane

orange —> colourless

removes the carbon carbon double bond

bromine = Br2

<ul><li><p>Addition reaction</p></li></ul><p>alkene + bromine —&gt; dibromoalkane</p><p>orange —&gt; colourless</p><p>removes the carbon carbon double bond</p><p>bromine = Br<sub>2</sub></p>
6
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How can bromine water be used to distinguish between an alkane and alkene?

Alkene reaction : orange —> colourless

Alkane reaction : remain orange