Question

Which reactant should be used to convert propene to 1,2-dichloropropane?

Answer 1

propene +cl2 -> 1,2 dichloropropane

Answer 2

Reactant is shown below

Step-by-step explanation:

• To convert propene to 1,2-dichloropropane,
  `Cl_(2)` should be used in a polar aprotic slovent like
  `CH_(2)Cl_(2)`.
• Here,
  `Cl_(2)` adds onto double bond and forms a chloronium cation followed by nucleophilic attack by a chloride ion.
• Chloronium ion intermediate has transient carbocationic character, Therefore chloride ion attack at more substituted position.
• Reaction mechanism has been shown below.