Understanding SN1 and E1 Reactions

What is the first step in a unimolecular nucleophilic substitution (SN1) reaction?

• The nucleophile attacks the substrate.

• The leaving group leaves in a heterolysis step.

• The formation of a double bond.

• The nucleophile is eliminated.

In an SN1 reaction, what is formed after the leaving group departs?

• A double bond.

• A nucleophile.

• A carbocation intermediate.

• A radical.

Which of the following does not appear in the overall reaction of an SN1 mechanism?

• Overall reactants.

• Overall products.

• Intermediates.

• Transition states.

How many transition states are present in the reaction free energy diagram of an SN1 reaction?

• One.

• Two.

• Three.

• Four.

In the context of an SN1 reaction, what is the significance of the local energy minimum in the free energy diagram?

• It represents the transition state.

• It represents the intermediate.

• It represents the overall reactants.

• It represents the overall products.

Tags

NGSS.HS-PS1-4

What is the first step in a unimolecular elimination (E1) reaction?

• The nucleophile attacks the substrate.

• The leaving group leaves, generating a carbocation intermediate.

• The formation of a double bond.

• The nucleophile is eliminated.

In an E1 reaction, what happens after the carbocation intermediate is formed?

• A nucleophile attacks the carbocation.

• H1 is eliminated with the aid of a base to yield a double bond.

• The leaving group reattaches.

• The reaction stops.

How many transition states are present in the free energy diagram of an E1 reaction?

• One.

• Two.

• Three.

• Four.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

Which of the following best describes the coordination step in an SN1 reaction?

• The leaving group departs.

• The nucleophile attacks the carbocation.

• The formation of a double bond.

• The nucleophile is eliminated.

What is the role of a base in an E1 reaction?

• To attack the carbocation.

• To eliminate H1 and form a double bond.

• To stabilize the leaving group.

• To form a radical.