Practice Problem: Crossed Aldol Products

The video tutorial explains the aldol condensation reaction involving acetone and a two-carbon aldehyde in the presence of sodium hydroxide. It covers the formation of enolates from both aldehyde and acetone, leading to four possible aldol condensation products. The tutorial emphasizes the concept of crossed aldol reactions, where both compounds can act as nucleophiles and electrophiles, resulting in different products. The video also provides insights into the mechanisms of these reactions, highlighting the role of alpha protons and the formation of new carbon-carbon bonds.

What is the main chemical reaction discussed in the practice problem involving acetone and a 2-carbon aldehyde?

• Aldol condensation

• Grignard reaction

• Diels-Alder reaction

• Friedel-Crafts acylation

What role do alpha protons play in the formation of enolates from aldehydes and ketones?

• They form hydrogen bonds with water

• They are extracted to form enolate anions

• They stabilize the carbonyl group

• They act as electrophiles

In the aldol addition reaction, what type of bond is formed between the enolate and the carbonyl compound?

• Carbon-carbon bond

• Hydrogen bond

• Carbon-oxygen bond

• Ionic bond

What is a characteristic feature of crossed aldol products?

• They do not involve enolate formation

• They involve only one type of enolate

• They are always symmetrical

• They are formed from two different carbonyl compounds

How many aldol condensation products are formed from the aldehyde enolate in the discussed reaction?

• One

• Two

• Three

• Four

What happens when an enolate from acetone attacks another acetone molecule?

• The reaction stops

• The enolate is destroyed

• A new carbon-carbon bond is formed

• A new carbon-oxygen bond is formed

How many total aldol condensation products are formed in the reaction discussed?

• Two

• Five

• Four

• Three