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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3el258

Select all correct statements about the compound shown.

  1. AIt contains an ester group
  2. BIts N-H is acidic, so it forms a sodium salt
  3. CIts molecular formula is C7H5NO3S
  4. DIt contains a sulphonamide-type S-N bond

Answer: B, C, D

The compound shown is saccharin (1,2-benzisothiazol-3-one 1,1-dioxide). The NH lies between C=O and SO2, so it is acidic and gives the soluble sodium salt. The S-N bond is part of a cyclic sulphonamide. There is no ester; the C=O is an amide-type carbonyl. The formula is C7H5NO3S.
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