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CBSE Class 12-science Answered

<div>Why methanoic acid(formic acid) shows Fehlings and Tollen's test, despite not having aldehyde functional group?</div>
Asked by Aswin | 17 Feb, 2016, 05:55: PM
Expert Answer
Formic acid has both aldehydic (-CHO)  and carboxylic (-COOH) functional groups.
Hence, it gives both Tollen's and Fehling's test positive.
 
Reaction of formic acid with Tollen's reagent:
HCOOH + 2[Ag(NH3)2]+ +2OH- → 2Ag + CO+ 2H2O  + 4NH3
Reaction of formic acid with Fehling's reagent:
HCOOH + 4OH- + 2Cu2+(in complex)  → CO2 + 3H2O + Cu2O
Answered by Prachi Sawant | 18 Feb, 2016, 12:01: PM
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