Ethene, C2H4\text{C}_2\text{H}_4C2H4, reacts with water vapour. Which statement about the product is correct?
It has the formula C2H6O\text{C}_2\text{H}_6\text{O}C2H6O and contains a hydroxyl group
It has the formula C2H4O\text{C}_2\text{H}_4\text{O}C2H4O and contains a carboxyl group
It has the formula C2H6\text{C}_2\text{H}_6C2H6 and contains only single bonds
It has the formula C2H4O2\text{C}_2\text{H}_4\text{O}_2C2H4O2 and contains a carboxyl group