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A benzene ring carries a group at C-1 and a group para to it. The IUPAC name is

  1. A4-methylbenzoic acid
  2. B2-methylbenzoic acid
  3. C1-methylbenzene-4-carboxylic acid
  4. D3-methylbenzoic acid

Answer: A

The carboxylic acid is the principal group, so the parent is benzoic acid with the carbon bearing COOH numbered 1. Para means position 4, giving 4-methylbenzoic acid.
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