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Question:

Increasing order of reactivity of the following compounds for SN1 substitution is:

(B)<(C)<(D)<(A)

(A)<(B)<(D)<(C)

(B)<(A)<(D)<(C)

(B)<(C)<(A)<(D)

Solution:

Correct option is C (B)<(A)<(D)<(C)
In SN1 mechanism the intermediate carbocation formed, more stable the carbocation more is the reactivity.
SN1 Reactivity order Order C > D > A > B.