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