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Two chlorine atoms on a benzene ring are in the meta relationship. Their locants in the IUPAC name are

  1. A1,2
  2. B1,3
  3. C1,5
  4. D1,4

Answer: B

Ortho means adjacent (1,2), meta means separated by one carbon (1,3), and para means opposite (1,4). The lowest-locant numbering gives 1,3-dichlorobenzene; 1,5 is the same relationship counted the long way round and is not used.
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