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JEE Main levelOne or more correct optionsDifficulty 2 of 3g3197

Concerning the sulfonation of naphthalene with conc. , which statements are correct?

  1. AAt for a long time the major product is naphthalene-2-sulfonic acid
  2. BSulfonation is reversible at the higher temperature
  3. CNaphthalene-1-sulfonic acid is thermodynamically more stable than the 2-isomer
  4. DAt the major product is naphthalene-1-sulfonic acid

Answer: A, B, D

The 1-acid forms faster and dominates under kinetic control. At desulfonation makes the reaction reversible, so the more stable 2-acid accumulates. The 1-acid is less stable because of the peri strain, so the last statement is false.
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