Question

what is the action of thionyl chloride on carboxylic acid​

Answer 1

Answer:

Thionyl chloride returns the thionyl chloride and produces Sulphur dioxide and hydrologic  acid in gaseous form.

The reaction goes like:

RCOOH(aq) + SO2Cl(aq) $\longrightarrow$ RCOCl (aq)  + SO2(g) + HCl(g)

It's exothermic