Chapter 21 - Enols and Enolates (Test Bank)

1. How many a-hydrogens does 2-hexanone have?




A. 3
B. 4
C. 5
D. 6

Accessibility: Keyboard Navigation
Bloom's Level: 2. Understand
Chapter: 21
Difficulty: Easy
Gradable: automatic
Section: 21.01
Subtopic: IUPAC nomenclature of aldehydes and ketones
Subtopic: Physical properties of aldehydes and ketones
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones


2. Which one of the following cannot form an enolate anion?

A. 2,2-dimethylbutanal
B. 2-ethylbutanal
C. 2,3-dimethylbutanal
D. 3,3-dimethylbutanal

Accessibility: Keyboard Navigation
Bloom's Level: 2. Understand
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.02
Subtopic: IUPAC nomenclature of aldehydes and ketones
Subtopic: Physical properties of aldehydes and ketones
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones




21-1
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McGraw-Hill Education.

,3. Which of the following have an enol form?

I. benzaldehyde, C6H5CHO
II. 2,2-dimethylpropanal, (CH3)3CCHO
III. 2-chloropropanal, CH3CHClCHO




A. only I
B. only II
C. only III
D. all of them have an enol form

Accessibility: Keyboard Navigation
Bloom's Level: 2. Understand
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.01
Subtopic: Physical properties of aldehydes and ketones
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones


4. Which one of the following has two different enol forms?

A. cyclohexanone
B. 2,2-dimethylcyclohexanone
C. 3,3-dimethylcyclohexanone
D. 4,4-dimethylcyclohexanone

Accessibility: Keyboard Navigation
Bloom's Level: 2. Understand
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.01
Subtopic: IUPAC nomenclature of aldehydes and ketones
Subtopic: Physical properties of aldehydes and ketones
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones




21-2
Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of
McGraw-Hill Education.

,5. How many alpha hydrogens are there on 2,4-dimethyl-3-pentanone?

A. two
B. three
C. four
D. six

Accessibility: Keyboard Navigation
Bloom's Level: 2. Understand
Chapter: 21
Difficulty: Easy
Gradable: automatic
Section: 21.01
Subtopic: IUPAC nomenclature of aldehydes and ketones
Subtopic: Physical properties of aldehydes and ketones
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones
6. Identify the most acidic hydrogen in the following compound.




A. 1
B. 2
C. 3
D. 4

Bloom's Level: 4. Analyze
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.02
Subtopic: Acid strength of functional groups
Subtopic: Factors affecting acid strength
Topic: Acids and Bases




21-3
Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of
McGraw-Hill Education.

, 7. What is the product of the reaction below?




A. A
B. B
C. C
D. D

Bloom's Level: 3. Apply
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.07
Subtopic: Reactions of aldehydes and ketones acting as nucleophiles
Topic: Aldehydes and Ketones
8. Arrange the following compounds in order of decreasing acidity.




A. I > II > III
B. II > III > I
C. III > II > I
D. III > I > II

Bloom's Level: 4. Analyze
Chapter: 21
Difficulty: Medium
Gradable: automatic
Section: 21.02
Subtopic: Acid strength of functional groups
Subtopic: Factors affecting acid strength
Topic: Acids and Bases




21-4
Copyright © 2016 McGraw-Hill Education. All rights reserved. No reproduction or distribution without the prior written consent of
McGraw-Hill Education.