Nucleophilic Addition to Ketones and Aldehydes Quiz

What makes ketones and aldehydes good electrophiles in nucleophilic addition reactions?

• Their high electron density

• Their partially positive carbon

• Their non-polar nature

• Their ability to donate electrons

In nucleophilic addition, what happens to the electrons in the carbon-oxygen double bond?

• They remain unchanged

• They are transferred to the nucleophile

• They are pushed towards the oxygen

• They are shared equally

Which of the following is the most reactive in nucleophilic addition reactions?

• Aldehyde

• Ketone

• Formaldehyde

• All are equally reactive

What is the role of sterics in the reactivity of ketones and aldehydes?

• Sterics decrease the reactivity of bulkier ketones

• Sterics have no effect on reactivity

• Sterics increase the reactivity of ketones

• Sterics make aldehydes less reactive

What is added across the carbon-oxygen double bond in a hydration reaction?

• Carbon dioxide

• Oxygen

• Water

• Hydrogen gas

Under base-catalyzed conditions, what acts as the nucleophile in the hydration of ketones and aldehydes?

• Hydronium ion

• Carbon dioxide

• Water

• Hydroxide ion

In acid-catalyzed hydration, why is the carbonyl oxygen protonated first?

• To increase the electrophilicity of the carbonyl carbon

• To prevent nucleophilic attack

• To increase the nucleophilicity of water

• To make the carbonyl carbon less electrophilic

Which compound has the highest equilibrium constant for hydrate formation?

• Ketone

• Aldehyde

• Formaldehyde

• All have the same constant

Why is formaldehyde more reactive than typical aldehydes in nucleophilic addition?

• It forms weaker bonds

• It has a more positive carbonyl carbon

• It has a less positive carbonyl carbon

• It has more steric hindrance

What is the significance of the equilibrium constant in hydrate formation?

• It indicates the speed of the reaction

• It shows the amount of hydrate formed

• It determines the temperature of the reaction

• It measures the acidity of the solution