JIPMER 2018 Morning Paper

(2)
Step 1 : Formation of a stronger electrophile.

Step 2 : Electrophilic attack and formation of the sigma complex.

Step 3 : Loss of a proton gives the products.

Other halogenating agents are ICl, HOCl etc.
order of effectiveness – Cl2 > BrCl > Br2 > ICl>I2