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(D) The preparation of a secondary amine is best achieved by the reaction of a primary amine with an alkyl halide. This is a nucleophilic substitution

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Reaction of a primary amine with an alkyl halide.

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(D) The preparation of a secondary amine is best achieved by the reaction of a primary amine with an alkyl halide. This is a nucleophilic substitution reaction where the primary amine acts as a nucleophile and attacks the alkyl halide to form a secondary amine. $R-NH_2 + R'-X \rightarrow R-NH-R' + HX$. Option $A$ (Hoffmann bromamide degradation) produces a primary amine. Option $B$ (Reduction of a nitrile) produces a primary amine. Option $C$ (Reaction of an alkyl halide with excess ammonia) primarily produces a primary amine.

Among the following set of reactions,the most suitable method for preparing a secondary amine is:

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