Select the fastest way to differentiate between the organic and aqueous layers o
ID: 988397 • Letter: S
Question
Select the fastest way to differentiate between the organic and aqueous layers of an extraction.
a. Hold a white piece of paper behind the separatory funnel. The organic layer will have a slight yellow color, while the aqueous layer will be colorless.
b. Add a few drops of one of the layers to a test tube containing 1 mL of water. Shake the test tube to determine the solubility of the layer in water.
c. Separate the layers and heat them. The organic layer will have the lowest boiling point.
d. Weigh equal volumes of each layer. The aqueous layer will have the highest mass.
The Wittig reaction involves the generation of an ylide intermediate. What is an ylide?
a. A molecule or intermediate with positive and negative formal charges on adjacent atoms.
b. A molecule or intermediate where the C-2 proton is acidic.
c. A molecule or intermediate that has d orbitals available for bonding to adjacent atoms.
d. A molecule or intermediate caused by a deficiency of protons.
Explanation / Answer
The fastest way to differentiate between the organic and aqueous layers of an extraction is,
b. Add a few drops of one of the layers to a test tube containing 1 mL of water. Shake the test tube to determine the solubility of the layer in water.
The Wittig reaction involves the generation of an ylide intermediate. An ylide is,
a. A molecule or intermediate with positive and negative formal charges on adjacent atoms.
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