vikas askiitian expert
Last Activity: 14 Years ago
this reaction will peoceed through SN1 path
first step is protonation(H+ from HBr) & formation of O+H2 , this group is highly strong leaving group ...
now , carbocation formation takes place & reactivity is governed on the basis of carbocation stablity ...
most stable III , due to presence ofO-CH3 group , this will disperse +ve charge on carbon ...
then I , coz here no electron withdrawing groups ...
then IV , highly unstable due to EW effect of Br ..
then II , highly unstable coz EW (inductive as well as resonance) effect of NO2
option A) is correct