Sample pre-lab quiz for Grignard experiment.

Besides the types of questions below, questions on handling of wastes and on lab etiquette will be included on all prelab quizzes.

1) Grignard reagents add to:

1. aldehydes
2. ketones
3. esters
4. all of the above

2) After the addition of a Grignard reagent to a ketone, as in the reaction below, the product will be:

3) In the lab, Grignard reactions can be slow to initiate because they react with one of the following, effectively quenching the reactivity of the reagent:

1. benzophenone
2. vacuum grease
3. hexanes
4. water

4) In the lab, Grignard reactions can be slow to initiate because of the magnesium metal turnings. This is because:

1. magnesium is flammable
2. the magnesium is coiled too tightly
3. the magnesium reacts with air to form a magnesium oxide coating
4. magnesium reacts with water

5) When you have diethyl ether and aqueous solutions in your separatory funnel, the diethyl ether will be:

1. on top
2. on bottom

6) The purpose of the saturated aqueous sodium chloride wash is to:

1. remove water from the organic layer
2. increase the solubility of the product in the aqueous layer
3. both a and b
4. none of the above

Answers.