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Solution


Q.

Identify the correct order of reactivity for the following pairs towards the respective mechanism.           [2023]

Choose the correct answer from the options given below:
1 (A), (B) and (D) only  
2 (A), (B), (C) and (D)  
3 (B), (C) and (D) only  
4 (A), (C) and (D) only  

Ans.

(2)

Reactivity of SN2∝1Steric crowding(1°>2°>3°) halide

Reactivity of SN1∝ Stability of carbocation (Benzyl cation>1°-cation)

Reactivity of electrophilic substitution reaction ∝ Electron density. (-Cl is more electron donating group, while -NO2 is electron withdrawing group)

Reactivity of nucleophilic substitution reaction ∝1Electron density

-I effect group creates more reactive site for nucleophile.

-I effect of NO2>-I effect of Br