Experiment 7

• What is the title of experiment 7?

  Analysis of Alcohol and Phenols
• These are aliphatic group that contains Hydroxyl (–OH) group.

  Alcohols
• These are aromatic compounds with –OH group attached to the ring.

  Phenols
• These are tests for the reaction of alcohols EXCEPT

  a ) Chromic acid test

  b ) Bromine water test

  c ) Sodium metal test

  d ) Lucas test

  b
• Primary alcohol are readily oxidized to aldehydes which are oxidized further to

  Carboxylic acid
• Secondary alcohols are oxidized to

  Ketones
• Reaction of alcohol may be grouped into these EXCEPT

  a ) Removal of an acidic hydrogen

  b ) Oxidation reaction

  c ) heating of carboxylic acid

  d ) Replacement of –oh group

  c
• These alcohols do not undergo oxidation.

  Tertiary alcohols
• Chromic Acid Test: When the dichromate ion is reduced to a chromic ion, what color is produced?

  blue-green
• Chromic Acid test: What is the oxidizing agent used in the presence of sulfuric acid?

  K2Cr2O7
• Chromic Acid Test: What color is the K2Cr2O7 (Potassium dichromate)?

  yellow-orange
• This test involves the formation of water immiscible organic halide.

  Lucas test
• In the Lucas test, what reaction is used by the SN1 mechanism?

  Substitution
• This is a test for the presence of easily replaceable hydrogens in alcohols.

  Sodium Metal test
• What are weakly acidic compounds that react with active metals like sodium to liberate hydrogen gas?

  Alcohols
• The electrophilic reactions of phenols are at the _ and _ positions relative to the -OH group.

  ortho and para
• These are the tests for the reactions of Phenols EXCEPT

  a ) Chromic Acid test

  b ) Ferric Chloride test

  c ) Bromine Water test

  d ) Sodium Hydroxide test

  a
• Phenols form a colored complex ranging from _ to _ with neutral ferric chloride.

  red to blue
• What color is the tetrabromocyclohexadiene?

  yellow
• What is added to the precipitate of tribromophenol to convert it to a tetrabromocyclohexadiene?

  excess of bromine water
• When an excess of bromine water is added to the precipitate of tribromophenol, what is produced?

  tetrabromocyclohexadiene
• Phenols react with NaOH to form phenolate anions which are easily oxidized to _ colored product.

  brown
• True or False: Sodium metal reacts violently with water, with the production and possible combustion of hydrogen gas.

  True
• What are the three reagents used in the tests for the reactions of alcohols?

  n butyl

  s butyl

  t butyl
• In what test for the reactions of alcohols is the color change observed?

  Chromic acid test
• In what test for the reactions of alcohols is the appearance of immiscible layers observed?

  Lucas test
• In what test for the reactions of alcohols is the evolution of gas observed?

  Sodium metal test
• What is the percentage of the aqueous K2Cr2O7 in the Chromic acid test?

  10%
• What are the reagents used in the tests for the reactions of Phenols?

  phenol

  resorcinol

  a naphthol
• Until a _ color is retained, bromine water is continuously added to the test compounds, dropwise.

  red
• Phenols react with NaOH to form

  phenolate anions
• In the Lucas test, how many drops of Lucas reagent is added to n, s, t-butyl?

  20
• In the Sodium hydroxide test, if there is no color change, how long should you let the mixture sit?

  30 mins