Nomenclature of carboxylic acids - class-X

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Sodium salt of an organic acid 'X' produces effervescence with conc. $H _2SO _{4}$. 'X' reacts with the acidified aqueous $CaCl _2$ solution to give a white precipitate which decolourises acidic solution of $KMnO _4$. 'X' is

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$C _6H _5COONa$

$HCOONa$

$CH _3COONa$

$Na _2C _2O _4$

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