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MHT CET Chemistry Haloalkanes and Haloarenes 2026 MHT CET 2026 (17 April Shift 2)

MHT CET Chemistry Question (2026) — Solution

Question

Identify the product obtained when 2-chlorobutane is heated with aqueous solution of potassium hydroxide.

Options

  1. A. But - 1 - ene
  2. B. But - 2 - ene
  3. C. Butan - 1 - ol
  4. D. Butan - 2 - ol

Answer

D. Butan - 2 - ol

Step-by-step solution

When an alkyl halide is treated with an aqueous solution of potassium hydroxide (KOH), it undergoes a nucleophilic substitution reaction. The hydroxide ion (OH^-) acts as a nucleophile and replaces the halogen atom. For 2-chlorobutane, the reaction proceeds as follows: CH_3-CH(Cl)-CH_2-CH_3 + KOH(aq) CH_3-CH(OH)-CH_2-CH_3 + KCl The chlorine atom at the second carbon is substituted by a hydroxyl group, resulting in the formation of Butan-2-ol. Answer: Butan - 2 - ol

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