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The ease of dehydrohalogenation of alkyl halide with alcoholic KOH is

Options

  1. A3 &deg; < 2 &deg; < 1 &deg;
  2. B3 ° > 2 ° > 1 °
  3. C3 &deg; < 2 &deg; > 1 &deg;
  4. D3 &deg; > 2 &deg; < 1 &deg;

Correct answer

B. 3 ° > 2 ° > 1 °

Step-by-step 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 ° > 2 ° > 1 ° .

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