MHT CET · Chemistry · Haloalkanes and Haloarenes

Which among the following is \(\mathrm{NOT}\) correct statement about \(\mathrm{S}_{\mathrm{N}} \mathrm{l}\) reaction?

A A more powerful nucleophile favours \(S_N l\) mechanism.
B \(\mathrm{S}_{\mathrm{N}} \mathrm{l}\) reaction proceeds via formation of carbocation intermediate.
C \(\mathrm{S}_{\mathrm{N}} 1\) reaction proceeds more rapidly in polar protic solvent.
D The rate of \(\mathrm{S}_{\mathrm{N}} \mathrm{l}\) mechanism is independent of the nature of nucleophile.

Verified Solution

Answer & Solution

Correct Answer

(A) A more powerful nucleophile favours \(S_N l\) mechanism.

Step-by-step Solution

Detailed explanation

A more powerful nucleophile attacks the substrate faster and favours \(\mathrm{S}_{\mathrm{N}} 2\) mechanism.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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