Why does formic acid give a positive test with tollens reagent?
Priyanshi , 8 Years ago
Grade 12
Organic Chemistry> Why does formic acid give a positive test...
1 Answers
Umakant biswal
Last Activity: 8 Years ago
dear priyanshi
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 as well as a carboxylic acid..like aldehydes it can be easily oxidised to carbonic acid (H2CO3) which decomposes to give CO2 and H2O.
HCOOH + [O] -----> [H2CO3] ----> CO2 + H2O
thus like aldehydes it reduces Fehling's solution to red ppt. of Cu2O.Tollen's reagent to silver mirror.
hope it clears now
regards
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 as well as a carboxylic acid..like aldehydes it can be easily oxidised to carbonic acid (H2CO3) which decomposes to give CO2 and H2O.
HCOOH + [O] -----> [H2CO3] ----> CO2 + H2O
thus like aldehydes it reduces Fehling's solution to red ppt. of Cu2O.Tollen's reagent to silver mirror.
hope it clears now
regards
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