Interpretation:
The reaction mechanism for the formation of an anhydride from the reaction of butanedioic acid and thionyl chloride has to be proposed.
Concept introduction:
Dicarboxylic acid reacts with thionyl chloride and undergoes nucleophilic substitiution reaction at one carboxylic group to form acyl chloride.
Acyl chloride is the most reactive carboxylic derivative functional group and hence nucleophilic
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