Cracking produces a mixture of small hydrocarbon molecules. One product is separated and used to make poly(ethene).
Which formula represents this product?
C2H4\text{C}_2\text{H}_4C2H4
C5H10\text{C}_5\text{H}_{10}C5H10
C4H8\text{C}_4\text{H}_8C4H8
C4H10\text{C}_4\text{H}_{10}C4H10