Question

Complete the following reactions : b) Benzene- 1,2-Dicarboxylic acid + Thionyl chloride Heat
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Answer 1

Answer:

Phthaloyl chloride will be formed as a result of this reaction.

Explanation:

Whenever the compound of a carboxylic acid is heated with thionyl chloride the hydroxide groups of the acid get substituted with the chloride group given by the thionyl chloride. Therefore in this case, as there are two carboxylic groups therefore on each of them the OH will be replaced by a Cl from thionyl chloride. and as a result, Phthaloyl chloride will get formed.

Answer 2

• Benzene-1,2-dicarboxylic acid or phthalic acid on heating with thionyl chloride forms phthloyl chloride.
• In this reaction, the hydroxyl groups of the acid groups are replaced by the chlorine groups of thionyl chloride.
• Therefore two hydroxyl groups of Benzene-1,2-dicarboxylic acid are replaced by two chloride ions of thionyl chloride and form the final product phthloyl chloride.