Sample Exam IV problems_CH11to13

Sample Exam IV problems_CH11to13 - Which of the following...

Info iconThis preview shows pages 1–18. Sign up to view the full content.

View Full Document Right Arrow Icon
Which of the following is the product of the S N 2 reaction between the hydroxide ion (HO–) and ( R )-CH 3 –CHDI? D = 2 H (deuterium) 1. 2. 3. 4. 5.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 3.
Background image of page 2
Consider the reaction of (S)-(–)-1-iodo-2- methylbutane to produce (+)-2-methyl-1-butanol. What is the absolute configuration of the product? 1. R 2. S 3. R and S (racemic mixture) 4. R and S (unequal amounts) 5. There is no chiral center in the product I + HO OH + I
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 2. S
Background image of page 4
Which of the following S N 2 reactions is expected to have the highest rate? 1. methyl bromide with water in DMSO 2. ethyl bromide with chloride in methanol 3. ethyl bromide with hydroxide in HMPA 4. ethyl chloride with ammonia in acetonitrile 5. methyl bromide with hydrosulfide (HS ) in HMPA
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 5. methyl bromide with hydrosulfide (HS ) in HMPA
Background image of page 6
When A and B react in t -BuOH, the above rate expression is observed. What is the most likely mechanism of this reaction? 1. E2 2. S N 2 3. E1 4. S N 1 5. It cannot be determined. -d[ A ]/dt = k[ A ][ B ] A : B : OK OTos
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 2. S N 2
Background image of page 8
What is the main reason that polar aprotic solvents are favored over polar protic solvents for S N 2 reactions? 1. Polar aprotic solvents dissolve nucleophiles more readily than polar protic solvents. 2. Polar aprotic solvents destabilize anions. 3. Polar aprotic solvents stabilize cations, including carbocations. 4. Polar aprotic solvents form stabilizing hydrogen bonds. 5. Polar aprotic solvents prevent rearrangements from occurring.
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 2. Polar aprotic solvents destabilize anions.
Background image of page 10
Select the substrate which would react fastest in the substitution reaction. 1. 2. 3. 4. 5. CH 3 NH 2 CH 3 CN ?
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 1.
Background image of page 12
Which electrophile will react the fastest by the S N 2 mechanism with cyanide (NC ) in DMF? 1. phenyl iodide (Ph–I) 2. vinyl tosylate (H 2 C=CH–OTos) 3. ethyl bromide 4. cyclohexyl bromide 5. benzyl tosylate (Ph-CH 2 -OTos)
Background image of page 13

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 5. benzyl tosylate (Ph-CH 2 -OTos)
Background image of page 14
Which of the following reagents is the best nucleophile for an S N 2 reaction? 1. methanol 2. methoxide 3. acetate 4. hydroxide 5. water
Background image of page 15

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Answer 2. methoxide
Background image of page 16
best way to carry out the following transformation? 1.
Background image of page 17

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 18
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/18/2012 for the course CHEM 112 taught by Professor Lemaster during the Spring '08 term at Boise State.

Page1 / 100

Sample Exam IV problems_CH11to13 - Which of the following...

This preview shows document pages 1 - 18. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online