3 (c) LPG contains propane and butane.
H
H
H
H
C
C
C
H
H
H
H
H
H
H
H
H
C
C
C
C
H
H
H
H
propane (i)
H
butane
Write down the molecular formula of butane. answer ..............................
(ii)
[1]
Look at the displayed formulas of propane and butane. Propane and butane are hydrocarbons. They are also alkanes. Explain why they are both hydrocarbons and alkanes. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ...................................................................................................................................... [3] [Total: 7]
Š OCR 2013
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