A technician has three hydrocarbon samples, A, B and C. Two of the samples are fractions obtained from crude oil by fractional distillation. The other sample was produced by cracking.
The technician shakes each sample with orange bromine water. The table shows the results.
| Sample | Colour of the bromine water after shaking |
|---|---|
| A | Orange |
| B | Colourless |
| C | Orange |
Explain which sample was produced by cracking. Use the results in the table.