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How is formic acid distinguished from ac...

How is formic acid distinguished from acetic acid ? 

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The only carboxylic acid that has `-CHO` group is formic acid . Formic acid reduces . Fehling.s solution and Tollen.s reagent , but not acetic acid
`HCOOH + 2 CuO to H_(2) O + CO_(2) + Cu_(2) O darr `(red)
`HCOOH + Ag_(2) O to H_(2) O + CO_(2) + 2 Ag darr` (white)
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(A) : Formic acid is stronger acid than acetic acid . (R) : +1 groups decrease acidic nature of carboxylic acids.