Ammonolysis of alkyl halides followed by the treatment with NaOH can be used to prepare primary,secondary and tertiary amines.
The purpose of NaOH in the reaction is:

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To activate ${NH}_{3}$ used in the reaction

To remove acidic impurities

To increase the reactivity of alkyl halide

To remove basic impurities

answer is B.

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Detailed Solution

Free amine obtained from ammonium salt with NaOH, & acidic impurities are removed by NaOH

$\begin{array}{l} R - X + N H_{3} \to R N H_{3}^{+} X^{-} \\ R N H_{3} X^{-} + N a O H \to R - N H_{2} + N a X + H_{2} O \end{array}$

Similarly 2°, 3° amines can also be prepared

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