1. Which of the following always performs an E2 reaction? DMSO Cl - LDA tertiary
ID: 588146 • Letter: 1
Question
1. Which of the following always performs an E2 reaction?
DMSO
Cl-
LDA
tertiary carbocation
2. What would happen to your yield if you didn't add enough base?
Lower yield
Higher yield
No change
3. What would happen to your yield if you added 4 equivalents of base?
Double the yield
Half the yield
Same as before
A
B
C
D
One of the following compounds undergoes an E2 reaction with potassium tert-butoxidemuch more slowly than the others (essentially, not at all). Which is it?
A
B
C
D
DMSO
Cl-
LDA
5.tertiary carbocation
2. What would happen to your yield if you didn't add enough base?
Lower yield
Higher yield
No change
3. What would happen to your yield if you added 4 equivalents of base?
Double the yield
Half the yield
Same as before
Which product is most likely for the following reaction?
A
B
C
D
One of the following compounds undergoes an E2 reaction with potassium tert-butoxidemuch more slowly than the others (essentially, not at all). Which is it?
A
B
C
D
Explanation / Answer
Qu 1)
All of E2 reactions are faster when the leaving group is a weak base. For the alkyl halides as leaving groups, the resulting order is I– > Br– > Cl– >> F–.
E2 reactions are usually faster when a strong base/nucleophile is used (there are some solvent effects on this).
polar aprotic solvents such as DMSO give faster SN2 reactions and For SN2 and E2 reactions, the rate is also proportional to the nucleophile/base concentration.
AS in example they did not mention any medium so i think cl- is the best Leaving group.
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