for Q. 72 the answer should be COOH  but it is not why is it so?
 

for Q. 72 the answer should be COOH  but it is not why is it so?   e

Dear Student,

The reaction between acetic acid and thionyl chloride leads to the substitution of the hydroxyl group , and not the carboxylic group.

The reaction can be given as:

$C{H}_{3}COOH + SOC{l}_2 \to C{H}_{3}COCl + HCl + S{O}_2$

Thionyl chloride can also react with other compounds containing hydroxyl group. For example:

$C_2{H}_{5}OH + SOC{l}_2 \to C_2{H}_{5}Cl + HCl + S{O}_2$

Thus, since it can react with a wide range of compounds containing hydroxyl group, and not only carboxylic acids, it is a confirmatory test for the presence of hydroxyl group, not carboxylic acids.

Hope this information will clear your doubts about this topic.

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