Question

0.42) On sulphonation of naphthalene at 165.C it gives
(1 marks
Ans.
1-Naphthalene sulfonic acid
2-Naphthalene sulfonic acid
3-Naphthalene sulfonic acid
1 and 2-Naphthalene sulfonic acid​

Answer 1

Answer:

Explanation:Naphthalene-2-sulfonic acid is an organic compound with the formula C10H7SO3H. A colorless, water-soluble solid, it is often available as the mono- and trihydrates C10H7SO3H.2H2O. It is one of two monosulfonic .

Answer 2

Naphthalene reacts with sulphuric acid at 165°C to yield 2-Naphthalene sulfonic acid.

• Naphthalene is an aromatic compound with molecular formula, $C_{10} H_{8}$.
• Naphthalene on sulfonation, can form two products, 1-naphthalene sulphonic acid, and 2-naphthalene sulphonic acid.
• 1-naphthalene sulphonic acid is a kinetically favored product and is formed first at lower temperatures, like 80°C.
• But at higher temperatures, at 165°C, a thermodynamically stable, 2-naphthalene sulphonic acid is formed. The reaction is given below: