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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3o2160

Which of the following compounds give only ONE mononitration product (counting constitutional isomers formed by replacing one ring hydrogen)?

  1. A1,3-dimethylbenzene
  2. B1,4-dimethylbenzene
  3. C1,2-dimethylbenzene
  4. D1,3,5-trimethylbenzene

Answer: B, D

In p-xylene all four ring hydrogens are equivalent. In mesitylene all three ring hydrogens are equivalent. m-Xylene gives three isomers (2-, 4- and 5-nitro) and o-xylene gives two (3- and 4-nitro).
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