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Solution


Q.

The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is:

(Given: Structures I and II are rigid)                               [2026]
1 IV < III < II < I  
2 II < I < III < IV  
3 I < II < III < IV  
4 III < I < II < IV  

Ans.

(2)

Rate of SN1 ∝ Stability of C⊕ formed

(I) and (II) are unstable due to Bredt's rule, (I) has more +I effect.

(II)<(I)<(III)<(IV)