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  4. The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is

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Q. The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is

NTA AbhyasNTA Abhyas 2020Organic Chemistry – Some Basic Principles and Techniques

Solution:

Such dehydrohalogenation follow $E_{2}$ mechanism. The driving force of such reaction is the stability of alkene produced. Since, tertiary alkyl halide can give more substituted alkene, it reacts fastest followed by secondary and primary $i.e., \, 3^\circ >2^\circ >1^\circ .$