Unsaturated hydrocarbons

3 marks · Easy

(a)

Name the alkene with three carbon atoms.

[1 mark]

(b)

Draw the displayed formula of this alkene.

[1 mark]

(c)

Write the molecular formula of this alkene.

[1 mark]

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

Show answer

(a) Propene

(b) Displayed formula as shown: H2C=CH–CH3 · must show H2C=CH–CH3 displayed formula, Correct double bond

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Correctly names the alkene with 3 carbon atoms as propene.

B1 (b) · 1 mark · Draws correct displayed formula for propene (H2C=CH–CH3 or equivalent displayed structure).

B1 (c) · 1 mark · Writes correct molecular formula as .

Worked solution

(a) The alkene with three carbon atoms is propene.

(b) Displayed formula: Or full structure with all atoms and bonds shown.