Question

Formation of phthalic anhydride takes place by which of the following reaction

1)isolation
2)cyclisation 3)decomposition 4)diazotization​

Answer 1

Answer:

ans. b cyclisation

Explanation:

....

Answer 2

Option B) cyclisation

Formation of phthalic anhydride takes place by cyclisation.

• Naphthalene or ortho-xylene is catalytically converted into phthalic anhydride, which is then hydrolyzed to give phthalic acid. Auguste Laurent, a French chemist, produced phthalic acid for the first time in 1836 by oxidising naphthalene tetrachloride.
• The primary method of producing phthalic anhydride is the selective oxidation of o-xylene supplied as a gas. The preferred method is multitubular reactors cooled by molten salts due to the high exothermicity of the reaction.
• When phthalic acid and ammonia combine, an ammonium salt is produced. When heated, the ammonium salt produces phthalimide.
• Phosphoric acid, also known as 1, 2-benzenedicarboxylic acid, is a colourless, crystalline chemical substance that is typically synthesised and sold as its anhydride.

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