When chlorine is passed through propene at 400^oC, which of the following is formed?

Allyl chloride

The answer should be (1) allyl chloride.

When chlorine is passed through propene at \(400^o\)C, a substitution reaction takes place. The chlorine atom replaces one of the hydrogen atoms on the propene molecule, forming allyl chloride.

Allyl chloride is a colorless, flammable liquid with a pungent odor. It is used as a precursor to other chemicals, such as vinyl chloride and 2-chloroethanol.

The other answer choices are incorrect. Vinyl chloride is formed when propene is chlorinated at a lower temperature. PVC is formed when vinyl chloride is polymerized. 1, 2-dichloroethane is formed when two molecules of chlorine react with one molecule of propene.