Question

the compound reacts with na2co3 and gives co2 and gives ppt when treated with tollens reagent
1.formic acid 2. acetone 3.acetamide 4. acetaldehyde

Answer 1

Formic acid is unique amongst simple carboxylic acids since it contains a hydrogen atom instead of an alkyl group(H-COOH, all other carboxylic acid contains an alkyl group attached to C instead of hydrogen on left side)....thus formic acid may be regarded both as an aldehyde (with Tollens reagent) as well as a carboxylic acid (with Na₂CO₃ and gives CO₂).