$S _{ N } 1$ reaction is basically a solvolysis reaction.
Polar protic solvents help the substrate to ionise and by the way get involved in $S _{ N } 1$ reaction.
If both Assertion: and Reason: are true and the Reason: is the correct explanation of the Assertion:
If both Assertion: and Reason: are true but the Reason: is not the correct explanation of the Assertion:
If Assertion: is true but Reason: is false
If both Assertion: and Reason: are false
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The Correct Option isA
Solution and Explanation
In $S_{N} 1$ reaction, first the substrate gets ionised and then, the nucleophile attacks at the cation. To ionise a substrate, presence of polar protic solvent is necessary, thus $S _{ N } 1$ reactions are basically solvolysis reactions.
Hence, Reason is the correct explanation for Assertion.
