Sulfonation of naphthalene by conc. sulfuric acid produces the 1-sulfonic acid at 120 ºC and the 2-sulfonic acid at 160 ºC.
Which of the following statements is not true?
A) the 2- sulfonic acid is kinetically favored
B) sulfonation is a reversible reaction
C) the 2- sulfonic acid is thermodynamically favored (more stable)
D) electrophilic attack at C-1 is favored over attack at C-2
Correct answer is 'a'. Because 1-sulfonic acid dominates at lower temperature. So 1-sulfonic acid is kinetically favoured product and 2-sulfonic acid is thermodynamically favoured product.
So "a" is incorrect statement.
That's why answer will be 'a'.