Fundamental Organic Chemistry

Experiment to differentiate between formaldehyde and Acetaldehyde :
Test Formaldehyde Acetaldehyde
1-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 at the interface
(A white ppt. appears
over the ring ) .
- Ve
2- nitroprusside sodium test:
In the test tube put 1ml of
aldehyde + 0.5 ml of Sodium
nitroprusside then put drops of
NaOH with shaking .
- Ve Dark red color .
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