Chemistry - Carboxylic acid and their Derivatives Question with Solution | TestHub

X is oxalic acid: it reduces acidified permanganate to ${\mathrm{Mn}}^{2+}$ while being oxidised to $\mathrm{C}{\mathrm{O}}_2$, gives insoluble calcium oxalate with $\mathrm{Ca}(\mathrm{OH}{)}_2$, and does not give the ordinary Tollens test. The other three choices cannot satisfy all observations. Therefore the 'cannot be' choices are A,B,D.