Question

What happens when Benzene ring reacts with Pcl5

Answer 1

Dear Student,

No product will be formed in this case. This is because, PCl₅ predominantly behaves as a nucleophile and bezene donot show nucleophilic reactions easily due to the high electron density on the benzene nucleus.
Chlorination on benzene can be done when the nucleophilicity of the attacking Cl is reduced by some solvent or by some catalyst. For eg. if Cl_​2 is added in presence of CCl₄, then chlorobenzene can be formed. Also, if Cl₂ is added in presence of AlCl₃ or FeCl₃, then also chlorination of benzene occurs to give chlorobenzene.