Sodium salt of an organic acid 'X' produces effervescence with conc. `H_(2)SO_(4)`. 'X' reacts with the acidified aqueous `CaCl_(2)` solution to give a white precipitate which decolourises acidic solution of `KMnO_(4) 'X'` is

Options

A. `C_(6)H_(5)COONa`
B. `HCOONa`
C. `CH_(4)COONa`
D. `Na_(2)C_(2)O_(4)`

Answer

D

Explanation

`underset(".X.")(Na_(2)C_(2)O_(4))+underset("(conc.)")(H_(2)SO_(4))rarrNa_(2)SO_(4)+underset("(oxalic acid)")(H_(2)C_(2)O_(4))`
`underset("Oxalic acid")(H_(2)C_(2)O_(4))overset("conc. "H_(2)SO_(4))rarr underset("effervescens")(COuarr+CO_(2)uarr+H_(2)C_(2)O_(4))`
`underset(".X.")(Na_(2)C_(2)O_(4))+CaCl_(2)+underset("(white ppt.)")(CaC_(2)O_(4)darr+2NaCl)`