Chemistry · Oct / Nov 2016 · Paper 12 · Question 4

Benzene and cyclohexane are both flammable liquids. They are able to mix with each other without separating into two layers. They have very similar boiling points. It is difficult to separate a mixture of these two liquids by fractional distillation. Why is it difficult to separate a mixture of benzene and cyclohexane by fractional distillation?

1. AThey are both flammable.
2. BThey are both liquids.
3. CThey have very similar boiling points.
4. DThey mix with each other completely.

As printed in the paper