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JEE Main · 2009 · 12 Apr 2009 · Offline · Haloalkanes and Haloarenes

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Which of the following on heating with aqueous KOH , produces acetaldehyde ?
  1. (A)
  2. (B)
  3. (C)
  4. (D)✓ Correct

Answer: (D)

Solution

A gem-dihalide, with both halogens on the same carbon, hydrolyses with aqueous potassium hydroxide to a carbonyl compound. Here first gives the unstable gem-diol , which at once loses water to yield acetaldehyde, . The other compounds do not give acetaldehyde under these conditions.

JEE Main · 2009 · 12 Apr 2009 · Offline · Single correct option

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