The structure of compound X is displayed below. Four claims are given about compound X. 1 X burns in air, producing carbon dioxide and water. 2 X changes bromine water from colourless to brown. 3 X is propene. 4 Reacting X with hydrogen increases the number of $\text{C-C}$ single bonds. Which claims are correct?
- A1 and 2
- B1 and 4
- C2 and 3
- D3 and 4