A primary alkyl halide would prefer to undergo

(i) S_N¹ reaction

(ii) S_N² reaction

(iii) ?-Elimination

(iv) Racemisation

<p><span data-teams="true">This is a multiple choice answer as classified in NCERT Exemplar</span></p><p>The Correct Answer is Option (ii).</p><p>When an alkyl halide with -hydrogen atoms reacts with a base or a nucleophile, depending on the nature of the alkyl halide, the strength of the base or nucleophile, the size of the molecules, and the reaction circumstances, it can undergo a specific kind of reaction. A substitution or elimination process can be followed by an alkyl halide, as well as the two kinds of substitution, <strong>S_N</strong><strong>¹</strong> and <strong>S_N</strong><strong>²</strong>. Because the entering nucleophile cannot engage with the bulky substituents on or near the carbon atom, the main alkyl halide prefers the <strong>S_N</strong><strong>²</strong>reaction. As a result, primary alkyl halides and methyl halides have the greatest proclivity for <strong>S_N</strong><strong>²</strong>reactions.</p>

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