Ethene reacts with HBr a) in the presence of CCl4 and b) in the absence of CCl4. What will be the results of the 2 rxns??

It is the electrophilic addition reaction-

a) in the absence of CCl4

Reaction Involved-

b)  in the presence of CCl4

High electronegativity difference between Hydrogen and Bromine  introduce high nucleophilic nature to Br atom i.e negative charge on bromine atom and electrophilic nature to hydrogen atom. This  do not allow  CCl4 to play any role in the reaction reactivity as electrophile react much faster than CCl4 .This is the reason one will obtain same product in both cases.

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