Which of the following reagents when heated with ethyl chloride, forms ethylene ?

Which of the following reagents when heated with ethyl chloride, forms ethylene ?
  1. Aqueous $\mathrm{KOH}$
  2. $\mathrm{Zn} / \mathrm{HCl}$
  3. Alcoholic $\mathrm{KOH}$
  4. $\mathrm{HI}$

Solution

Only alcoholic $\mathrm{KOH}$ gives dehydrohalogenation reaction. Ethyl chloride reacts with alcoholic KOH as-

Asked in: AP EAMCET 2006

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