1.1. A molecule of ethene is shown in Figure 1.

Figure 1

i) Describe the shape of the ethene molecule.

ii) State the angle labelled A in Figure 1.

1.2. A range of diols are shown in Figure 2.

Figure 2

Suggest why compounds A and B are the same compound but compounds C and D are isomers.

1.3. Name compounds C and D from part (b) using the E / Z naming system.

Compounds C and D are shown again in Figure 2.

Figure 2

1.4. Compound E, shown in Figure 3, is a derivative of compound C.

Figure 3

Suggest why the cis / trans naming system fails with compound E.