E1 Reaction Mechanism Concepts

What is a characteristic feature of the E1 reaction?

• It is a one-step reaction.

• It involves a bimolecular transition state.

• It is a two-step reaction with a unimolecular transition state.

• It is identical to the E2 reaction.

What is the first step in an E1 reaction?

• A nucleophile attacks the substrate.

• The leaving group departs, forming a carbocation.

• A proton is abstracted by a base.

• A double bond is formed.

What happens to the geometry of the carbon atom that loses the leaving group in the first step of an E1 reaction?

• It remains tetrahedral (SP3 hybridized).

• It becomes linear (SP hybridized).

• It changes from tetrahedral (SP3) to trigonal planar (SP2).

• It becomes pyramidal.

In the second step of the E1 reaction, what is the role of a weak nucleophile like water?

• It attacks the carbocation directly.

• It acts as a leaving group.

• It abstracts a proton to form a pi bond.

• It forms a new carbon-carbon single bond.