Experiment #6: Alcohols And Phenols
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What is the reagent of Lucas Test?
HCl-ZnCl2 Mixture
MULTIPLE CHOICE: Alcohols of no more than ______ C atoms are soluble in Lucas Reagent. a. 5 atoms b. 7 atoms c. 6 atoms d. 9 atoms
c. 6 atoms
TRUE OR FALSE: Alkyl Chlorides are soluble in Lucas Test
FALSE; they are insoluble
What is the positive result for Lucas Test?
Appearance of cloudiness because of white precipitate
IDENTIFICATION In the presence of _____________, it can convert alcohol to alkyl halides
Hydrogen Halide (HX)
Arrange the increasing order of the compound based on their reactivity: 2-butanol, 3-butanol, 1-butanol
3-butanol<2-butanol<1-butanol TAKE NOTE: Tertiary Alcohols: Fast Reaction Secondary Alcohols: Reaction after several minutes (would take some time) Primary Alcohols: Only upon heating
Determine the results of the following compound on Lucas Test: • 1-butanol • 2-butanol • tert-butanol • phenol
RESULTS: • • (negative) • • (positive) • • (positive) • • (negative)
What is the observation of phenol on Lucas Test?
Immiscible; the upper layer has brown and the bottom is clear
It is the reaction between Acetyl Chloride and a compound X-O-H (where X - hydrogen, alkyl group, or benzene ring)
Acetyl Chloride Test
What is the positive result of Acetyl Chloride Test?
Evolution of Heat and Gas or a Precipitate
What is the limitation in Acetyl Chloride Test?
Moisture present in the unknown will give a positive test
What is the product of Acetyl Chloride Test?
Ester
What is the positive result of Ferric Chloride Test?
Formation of colored complex (usually purple, red, blue, green, reddish brown, violet)
Determine the results of the following compounds on Ferric Chloride Test? • 1-butanol • Phenol
• • (negative) • • (positive)
What is the reagent of Ferric Chloride Test?
Ferric Chloride Fe (II)
What is the reagent of Bromine in Water Test?
Br2, H2O
What is the positive result of Bromine in Water Test?
Disappearance of the orange color
What is the product of Bromine in Water Test?
2,4,6 - tribromophenol
TRUE OR FALSE: The orange color disappeared in Bromine in Water Test because of tribromophenol
TRUE
IDENTIFICATION: Phenols are soluble in 5% NaOH solution but NOT in 5% NaHCO3, classifying it as __________?
Class A2 (Weaker Acid)
What is the colors of the precipitations formed when phenols got oxidized with the following reagents? • KMNO4 • H2CrO4
• Black Precipitation • Opaque Green
When testing with Lucas Test, what will happen in the compound of more than 6 carbon atoms?
It will become insoluble
In the positive result of Ferric Chloride Test, why its color is violet?
Because of conjugated bonds, (8 or more carbon atoms)
Determine the results of the following compounds on Bromine in Water Test? • 1-butanol • phenol
• • (negative) • • (positive)