Question: When crude oil is heated, then which of the following hydrocarbon is given off first?
A Kerosene
B Gasoline
C Paraffin
D Natural gas
Answer: Natural gas
| Sequences of hydrocarbons | Range of boiling point | |
| 1 | Natural Gas (Methane) | -161°C to -164°C |
| 2 | Ethane | -89°C to -88°C |
| 3 | Propane | -42°C to -44°C |
| 4 | Butane | -1°C to 1°C |
| 5 | Gasoline | 30°C to 205°C |
| 6 | Kerosene | 150°C to 275°C |
| 7 | Diesel Fuel | 180°C to 360°C |
| 8 | Lubricating Oil | 316°C to 371°C |
| 9 | Paraffin Wax | 370°C to 450°C |
| 10 | Heavy Residue | Above 345°C |