Experiment 8

• What does DNPH stand for?

  dinitrophenylhydrazine
• When the carbonyl groups of aldehydes and ketones react with 2,4-DNPH, a precipitate of _ is produced.

  2,4-dinitrophenylhydrazone
• The color of 2,4-dinitrophenylhydrazone may either be yellow or red-orange depending on the structure of the _ compound.

  carbonyl
• Bisulfite addition products are formed when aldehydes and methyl ketones are added with

  sodium bisulfite
• True or False: Ketones are more easily oxidized than aldehydes.

  False
• Tollen's reagent is an alkaline solution of

  silver ammonia complex ion
• This is the only ketone that can be oxidized by Tollen's reagent.

  a-hydroxy ketones
• True or False: All ketones cannot be oxidized by Tollen's reagent.

  False
• Fehling's solution is a basic solution of cupric ion complexed with

  tartrate ion
• What is Schiff's reagent?

  leucosulfonic acid
• True or False: Schiff's reagent is a colorless solution.

  True
• Schiff's reagent is made by mixing _ and _

  fuchsin dye and sulfurous acid
• When Schiff's reagent is treated with an aldehyde, it is converted to a _ colored quinoid dye.

  magenta
• The test that can distinguish methyl ketones from other ketones.

  Iodoform test
• What is the color of iodoform?

  yellow
• True or False: Iodoform is water insoluble.

  True
• Methyl ketone is treated with _ in a basic solution to give an iodoform.

  iodine
• True or False: 2,4-DNPH can cause genetic mutation.

  True
• Acetaldehyde, benzaldehyde, and acetone are used in all tests EXCEPT for

  Iodoform test
• What are the three reagents used in 5 of the tests?

  acetaldehyde

  benzaldehyde

  acetone
• What are the three reagents used in Iodoform test for methyl ketones?

  acetaldehyde

  acetone

  ethanol
• A water bath was done in all of these tests EXCEPT for

  a ) Schiff's test

  b ) Iodoform test

  c ) 2,4-DNPH test

  d ) Fehling's test

  a
• In the 2,4-DNPH test, how long are the test tubes heated in a water bath?

  5 mins
• In Bisulfite test, 20 drops of this is added in acetaldehyde, benzaldehyde, and acetone?

  Sodium bisulfite (NaHSO3)
• In the Tollen's test, when the mixtures show no change after sitting for 5 mins, how long are the test tubes warmed in a water bath?

  5 mins
• How many drops of Fehling's A and Fehling's B reagents are added to each test tubes?

  10
• How many drops of Schiff's reagent is added to each test tubes?

  10
• How many mL of 10% NaOH is added to each test tubes?

  1
• I2 (Iodine) is added to KI (Potassium Iodide) dropwise until the _ color of iodine persists.

  brown
• In the Iodoform test, at what degree Celsius are the test tubes heated in a water bath?

  60
• In the Iodoform test, how long are the test tubes heated in a water bath?

  2 mins
• Iodoform test: If the brown color of iodine still persists after heating, what is added dropwise to each test tubes?

  10% NaOH
• Iodoform test: 10% NaOH is added dropwise until the brown color disappears and a _ color remains.

  yellow
• Iodoform test: When the brown color turns yellow, how many mL of water is added to each tube?

  2
• With Fehling's solution, cupric ion is reduced to


  cuprous oxide
• What is the title of experiment 8?

  Analysis of Carbonyl Compound (Aldehydes and Ketones)