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

• A

  Aqueous $\mathrm{KOH}$
• B

  $\mathrm{Zn} / \mathrm{HCl}$
• Correct answer
  C

  Alcoholic $\mathrm{KOH}$
• D

  $\mathrm{HI}$

Solution

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

Hence, the correct answer is option: 'C'.