Fundamental Organic Chemistry

O
O
H C H + Ag 2
O
H C OH + 2Ag
....(17)
formaldehyde formic acid silver metal
B)- Fehling's solution
In a test tube put 1ml of HCHO
+1ml of Fehling solution A +1ml
of Fehling solution B & then heat
on water bath for 3 min.
Solution turns green
and after some time
a red ppt.
Due to Oxidation of
HCHO to formic acid
& reduction for CuO to
Cu 2 O (red ppt.) (18)
O
O
H C H + 2 CuO H C OH + Cu 2 O
....(18)
formaldehyde
formic acid
4-Resorcinol Test :
In a test tube put 1ml of HCHO
+ drops of resorcinol +1ml of
H 2 SO 4 conc. added down the side
of the test tube.
Red violet ring is
formed & white ppt.
appears over the ring.
The aldehyde is
Formaldehyde.
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