Practice Test Questions: Organic Chemistry Alkanes and Halogenated Hydrocarbons

AS LEVEL CHEMISTRY

ASSESSED HOMEWORK

Answer all questions
Max 86 marks

Name ……………………………………………………………..

Mark ……../86 ……....% Grade ………

1. The graph below shows the boiling points of some alkanes. (a) Draw a smooth curve through the points on the graph and estimate the boiling points of octane C8H18, ……………… hexadecane, C16H34 .………………
[2]
(b) State how decane, C10H22, can be separated from a mixture of the alkanes.
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[1] (c) Isomerisation of hexane, C6H14, produces a mixture of structural isomers, three of which are shown in the boxes below.
(i) Draw, using skeletal formulae, two other structural isomers of hexane. [2]
(ii) Name isomer B. ....................................................................................
[1]
(iii) Isomers A, B and C have different boiling points. In the boxes below, list the isomers A, B and C in order of their boiling points. lowest boiling point highest boiling point
[1]
(iv) Explain the order given in (c) (iii).
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[2]
(d) Hexane can be reformed to produce cyclohexane as one of the products.
(i) Draw the structural formula of cyclohexane.

[1]
(ii) Write a balanced equation for the reforming of hexane into cyclohexane.

[1]
(iii) Suggest one reason why oil companies reform alkanes such as hexane.
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