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An organic compound ‘A’ of molecular formula C2H4O2 turns blue litmus red and gives brisk effervescence with NaHCO3. Identify ‘A’ and give chemical reaction.

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Given that A turns blue litmus red. So A is acidic in nature. 

Brisk effervescence with NaHCO3 indicates carbon dioxide as one of the products. 

The molecular formula of A contains 2 oxygen atoms. So the compound is likely to be a carboxylic acid (general molecular formula is CnH2nO2

Here n=2 and hence the compound A is ethanoic acid. The reaction is given by: 

CH3COOH + NaHCO3→ CH3COONa + H2O + CO2

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