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Victor Meyer Test
Classical test: Different colored solutions for 1° (red), 2° (blue), 3° (colorless) alcohols.
How It Works
1
Three Unknown Alcohols
Tubes A, B, C contain 1°, 2°, and 3° alcohols.
2
Add PI₃ then AgNO₂
First converts alcohol to alkyl iodide, then to nitroalkane.
3
Observe Color
Red = 1° alcohol. Blue = 2° alcohol. Colorless = 3° alcohol.
Reaction Key
1° Alcohol:
Red color (nitroalkane → nitrous acid → red)
2° Alcohol:
Blue color (pseudonitrol formed)
3° Alcohol:
No color (does not give test)