JEE Mains · Chemistry · STD 12 - 6. Haloalkanes and Haloarenes

Given below are two statements: Statement - \(I\): High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow \(\mathrm{S}_{\mathrm{N}} 2\) mechanism. Statement - \(II\): A secondary alkyl halide when treated with a large excess of ethanol follows \(\mathrm{S}_{\mathrm{N}} 1\) mechanism. In the the light of the above statements, choose the most appropriate from the questions given below:

A Statement \(I\) is true but Statement \(II\) is false
B Statement \(I\) is false but Statement \(II\) is true.
C Both statement \(I\) and Statement \(II\) are false.
D Both statement \(I\) and Statement \(II\) are true.

Verified Solution

Answer & Solution

Correct Answer

(D) Both statement \(I\) and Statement \(II\) are true.

Step-by-step Solution

Detailed explanation

Statement - \(I\): Rate of \(\mathrm{S}_{\mathrm{N}} 2 \propto[\mathrm{R}-\mathrm{X}]\left[\mathrm{Nu}^{-}\right]\) \(\mathrm{S}_{\mathrm{N}} 2\) reaction is favoured by high concentration of nucleophile \(\left(\mathrm{Nu}^{-}\right)\)& less crowding in the substrate molecule.…

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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