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JEE Main levelSingle correct optionDifficulty 2 of 3co241

The ketone shown is heated with excess NaOBr (from /NaOH) and then acidified. Which structure is the organic acid obtained?

  1. AStructure A
  2. BStructure B
  3. CStructure C
  4. DStructure D

Answer: A

The drawn compound is 4-bromoacetophenone, a methyl ketone. The haloform reaction converts COCH3 into COO(-) with loss of CHBr3, leaving the ring bromine untouched; acidification gives 4-bromobenzoic acid. The tribromomethyl ketone (C) is only an intermediate.
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