JEE MAIN - Chemistry (2007 - No. 19)
Which of the following is the correct order of decreasing SN2 reactivity?
RCH2X > R3CX > R2CHX
RCH2X > R2CHX >
R3CX
R3CX > R2CHX > RCH2X
R2CHX > R3CX > RCH2X
解释
In $${S_N}2$$ mechanism transition state is pentavelent. For bulky alkyl group it will have sterical hinderance and smaller alkyl group will favour the $${S_N}2$$ mechanism. So the decreasing order of reactivity of alkyl halides is $$RC{H_2}X > {R_2}CHX > {R_3}CX$$