Here, the compound\[X\]can be
A) acetic acid
B) formaldehyde
C) formic acid
D) propionic acid
Correct Answer: C
Solution :
Only carboxylic acids give acyl chloride with \[SOC{{l}_{2}}/\]pyridine. Among acids, only HCOOH (formic acid) due to the presence of aldehyde group, reduces Fehling solution. \[HCOOH\xrightarrow[Fehling\text{ }solution]{Cu{{(OH)}_{2}}}{{H}_{2}}O+C{{O}_{2}}+\underset{red\text{ }ppt}{\mathop{Cu{{O}_{2}}\downarrow }}\,\] \[HCOOH+SOC{{l}_{2}}\xrightarrow[{}]{Pyridine}\underset{\begin{smallmatrix} unstable \\ \,\,\,\,\,\,\,\,\,\downarrow \end{smallmatrix}}{\mathop{HCOCl}}\,+HCl\] \[HCl+CO\]
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