Alkanes

2 marks · Easy

Draw the displayed (structural) formula of an unbranched alkane with 3 carbon atoms. State the name of this alkane.

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Propane, displayed as Accept also a correct displayed formula with all bonds shown and 'propane' as the name.

Must show: All three carbon atoms in a chain, Correct number and placement of hydrogens (8), 'Propane' stated as name

Also accept: A correct displayed/structural formula for propane with 'propane' named.; Displayed formula showing all C-C and C-H bonds for propane.

Common mistakes: Butane or another alkane drawn; Incorrect hydrogen count (not 8); Name given as 'propanol'

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Marking points

M1 · 1 mark · Draws a correct displayed (structural) formula for propane: three carbons in a straight chain with correct number of hydrogens.

A1 · 1 mark · Correctly names the alkane as 'propane'.

Worked solution

Propane (3 carbon atoms) has the displayed formula:

Name: propane