A) acetic acid
B) ethanoic acid
C) oxalic acid
D) formic acid
Correct Answer: D
Solution :
The fatty acid that shows reducing property is formic acid. Formic acid have both groups carboxylic as well as aldehyde \[\underset{Formic\,acid}{\mathop{H-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OH\,\,\,}}\,\underset{Carboxylic\,group}{\mathop{\,H-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OH}}\,\,\,\,\underset{Aldehyde}{\mathop{H-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-OH}}\,\] This aldehyde group reduces Tollens reagent \[\underset{Formic\,acid}{\mathop{HCOOH}}\,+A{{g}_{2}}O\xrightarrow{Ammonical\,\,AgN{{O}_{3}}}\] \[{{H}_{2}}O+\underset{Silver\,mirror}{\mathop{C{{O}_{2}}+2Ag}}\,\]
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