Naming organic compounds

4 marks · Normal

(a)

The displayed formula of a hydrocarbon is shown below:

i) State the number of carbon atoms in the molecule.

[1 mark]

(b)

ii) State the general formula for alkanes.

[1 mark]

(c)

iii) Name the compound shown.

[2 marks]

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) 3

(b) CnH2n+2

Show mark scheme and worked solution

Marking points

B1 (a) · 1 mark · Gives the correct number of carbon atoms: 3.

B2 (b) · 1 mark · States the general formula for alkanes: CnH2n+2.

M1 (c) · 1 mark · Correctly identifies the compound is an alkane with 3 carbons (propane).

A1 (c) · 1 mark · Names the compound as propane.

Worked solution

(a) The structure has 3 carbon atoms.

(b) The general formula for alkanes is CnH2n+2.