Question 1

Acetoacetyl-CoA reacts with acetyl-CoA to give product A in the presence of 3-hydroxy-3-methyl-glutaryl-CoA synthetase. Identify the special feature of this reaction.

Accepted Answer

A)   It is enantioselective, and only the S enantiomer is formed.
B)   It is enantioselective, and only the R enantiomer is formed.
C)   It produces a non-superposable R enantiomer.
D)   It produces a racemic mixture used for various purposes.E) A) and B)
F) C) and D)

Question 2

What is the major organic product obtained from the following reaction?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and D)
F) A) and B)

Question 3

What is the major organic product obtained from the following reaction?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and C)
F) A) and B)

Question 4

What is the major organic product obtained from the following sequence of reactions?

Accepted Answer

The answer of What is the major organic product obtained...

Question 5

What is the major organic product obtained from the following reaction?

Accepted Answer

The answer of What is the major organic product obtained...

Question 6

What is the major organic product obtained from the following reaction?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and D)
F) A) and C)

Question 7

The class of compound formed in the reaction of the following two substance is a(n)__________.

Accepted Answer

The answer of The class of compound formed in the...

Question 8

In an aldol reaction the following substance could be produced by the reaction of benzaldehyde and _______________. Enter the name of the substance.

Accepted Answer

The answer of In an aldol reaction the following substance...

Question 9

What is the major organic product obtained from the following sequence of reactions?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and C)
F) A) and B)

Question 10

Claisen and aldol condensations can result in cyclization but the Robinson annulation cannot.

Accepted Answer

A) True 
 B)False

Question 11

What is the major organic product obtained from the following sequence of reactions?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) B) and C)
F) A) and B)

Question 12

The more the substitution of the _____ of an enolate anion, the greater its stability.

Accepted Answer

The answer of The more the substitution of the _____...

Question 13

How many different β-hydroxyaldehydes and β-hydroxyketones, including constitutional isomers and stereoisomers, are formed upon treatment of a mixture of acetone and acetophenone with base?

Accepted Answer

A)   4
B)   6
C)   9
D)   12E) A) and D)
F) All of the above

Question 14

What is the major organic product obtained from the following sequence of reactions?

Accepted Answer

The answer of What is the major organic product obtained...

Question 15

How many different β-hydroxyaldehydes and β-hydroxyketones, including constitutional isomers and stereoisomers, are formed upon treatment of a mixture of butanal and acetone with base?

Accepted Answer

A)   4
B)   6
C)   9
D)   12E) None of the above
F) A) and B)

Question 16

What is the major organic product obtained from the following sequence of reactions?

Accepted Answer

A)   1
B)   2
C)   3
D)   4E) A) and D)
F) B) and C)

Question 17

In an aldol reaction the following substance could be produced by the reaction of acetone (propanone) and _______________. Enter the name of the substance.

Accepted Answer

methanal
f...

Question 18

What is the major organic product obtained from the following reaction?

Accepted Answer

The answer of What is the major organic product obtained...

Question 19

In a Claisen condensation catalyzed by the enzyme thiolase, acetyl-CoA is converted to its _____ ion, which then adds to the carbonyl group of the second molecule of acetyl-CoA to give a tetrahedral addition intermediate.

Accepted Answer

The answer of In a Claisen condensation catalyzed by the...

Question 20

Tautomerization is catalyzed by both acids and bases.

Accepted Answer

A) True 
 B)False

Exam 19: Enolate Anions and Enamines

The more the substitution of the _____ of an enolate anion, the greater its stability.

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following sequence of reactions?

Correct AnswerverifiedShow Answer

In an aldol reaction the following substance could be produced by the reaction of acetone (propanone) and _______________. Enter the name of the substance.

Correct Answerverifiedmethanalf...View AnswerShow Answer

The class of compound formed in the reaction of the following two substance is a(n)__________.

Correct AnswerverifiedShow Answer

How many different β-hydroxyaldehydes and β-hydroxyketones, including constitutional isomers and stereoisomers, are formed upon treatment of a mixture of butanal and acetone with base?

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following sequence of reactions?

Correct AnswerverifiedShow Answer

Acetoacetyl-CoA reacts with acetyl-CoA to give product A in the presence of 3-hydroxy-3-methyl-glutaryl-CoA synthetase. Identify the special feature of this reaction.

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following sequence of reactions?

Correct AnswerverifiedShow Answer

In a Claisen condensation catalyzed by the enzyme thiolase, acetyl-CoA is converted to its _____ ion, which then adds to the carbonyl group of the second molecule of acetyl-CoA to give a tetrahedral addition intermediate.

Correct AnswerverifiedShow Answer

Tautomerization is catalyzed by both acids and bases.

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

Claisen and aldol condensations can result in cyclization but the Robinson annulation cannot.

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following sequence of reactions?

Correct AnswerverifiedShow Answer

In an aldol reaction the following substance could be produced by the reaction of benzaldehyde and _______________. Enter the name of the substance.

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following reaction?

Correct AnswerverifiedShow Answer

How many different β-hydroxyaldehydes and β-hydroxyketones, including constitutional isomers and stereoisomers, are formed upon treatment of a mixture of acetone and acetophenone with base?

Correct AnswerverifiedShow Answer

What is the major organic product obtained from the following sequence of reactions?

Correct AnswerverifiedShow Answer

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methanal
f...
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