A single molecule of dodecane, $\text{C}_{12}\text{H}_{26}$, undergoes cracking to give three product molecules, X, Y and Z. X is an alkane with a straight chain. Y and Z are straight-chain alkenes that have different $M_r$ values. Which of the following statements about X, Y and Z are correct?
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct