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Amines Part 1

Section: Chemistry

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Question : 25 of 100

Marks: +1, -0

Ammonolysis of alkyl halides followed by the treatment with

\mathrm{NaOH}

solution can be used to prepare primary, secondary and tertiary amines. The purpose of

\mathrm{NaOH}

in the reaction is

[16 Mar 2021 Shift 2]

to remove basic impurities
to activate $\mathrm{NH}_3$ used in the reaction
to remove acidic impurities
to increase the reactivity of alkyl halide

Solution:

Ammonolysis of alkyl halides

R-X\;\xrightarrow[-\ \mathrm{HX}]{\mathrm{NH}_3}R-\mathrm{NH}_2\;\xrightarrow[-\ \mathrm{HX}]{R-X}R_{2}\ \mathrm{NH}\;\xrightarrow[-\mathrm{HX}]{R-X}R_{3}\ \mathrm{N}\xrightarrow[]{R X}R_{4}\ \overset{\oplus}{\mathrm{N}}\overset{\ominus}{\mathrm{X}}

During the reaction

\mathrm{HX}

(acid) is formed. Hence, we use

\mathrm{NaOH}

to remove this acidic impurities.

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