Elimination reactions

Which of the following statements applies to the E2 mechanism?

• It occurs with inversion of stereochemistry

• It always produces the Zaitsev product

• It proceeds through the more stable carbocation intermediate.

• Depending on the base, it can produce Zaitsev or Hofmann products

The following energy diagram describes a:

• E2 reaction

• E1 reaction

• Sn2 reaction

• Sn1 reaction

Tags

NGSS.HS-PS1-4

What is the major product of this reaction?

• The top one

• The bottom one

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the major product of this reaction?

• The first one
• The second one

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the major product of this reaction?

• The first one
• The second one

What is the major product of this reaction?

• The first one
• The second one

The mechanism shown is associated with

• A E1 reaction

• A E2 reaction

• Neither

• Both

Tags

NGSS.HS-PS1-5

Which of the following reacts by the E1 mechanism in ethanol most readily?

• CH₃CH₂CH₂CH₂Br

• (CH₃)₂CHCH₂Br

• (CH₃)₃CBr

• 

Tags

NGSS.HS-PS1-5

Which of the following statements regarding regioselectivity of elimination reactions is wrong?

• More substituted, more stable alkenes are generally formed preferentially by both E1 and E2 mechanisms.

• Substrates with a poorer nucleophilicity tend to give the less substituted alkenes.

• Sterically hindered, bulky bases tend to give the less substituted alkenes.

• Reactions by the E1 mechanism are generally less regioselective than those by the E2 mechanism.

Which of the following statements regarding mechanisms of elimination reaction is wrong?

• The E1 mechanism does not require a base.

• The E2 mechanism generally occurs under highly basic conditions.

• The E2 mechanism is stereospecific.

• The E1 mechanism is usually unimolecular in the rate-determining step but leads to a second order rate law.