Ethene is prepared industrially by
Reforming
Polymerization
Distillation
Cracking
Correct answer is D
Ethene is produced from cracking which involves breaking up large hydrocarbon molecules into smaller and more useful bits. This is achieved by using high temperatures and pressures without a catalyst.
C15H32 → 2C2H4 + C3H6 + C8H14
......Δheat...ethene........propene.........octane