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)
The correct order of the rate of reaction of the following reactants with nucleophile by SN1 mechanism is:
(Given : Structure I and II are rigid)

Held on 22 Jan 2026 · Verified 6 Jul 2026.
III < I < II < IV
IV < III < II < I
I < II < III < IV
II < I < III < IV
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