Organic And Biological Chemistry
Organic And Biological Chemistry
7th Edition
ISBN: 9781305081079
Author: STOKER, H. Stephen (howard Stephen)
Publisher: Cengage Learning,
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Chapter 4, Problem 4.79EP

(a)

Interpretation Introduction

Interpretation:

The inorganic product formed when butanal undergoes Tollen’s test has to be given.

Concept Introduction:

In organic chemistry, oxidation reaction is referred to the number CO bonds increase and/or number of CH bonds decrease.

In organic chemistry, reduction reaction is referred to the number CO bonds decrease and/or number of CH bonds increase.

Alcohols undergo oxidation reaction and reduction reaction.  This depends upon the number of hydrogen atoms that is bonded to the alpha carbon atom.  Primary and secondary alcohol undergoes oxidation reaction while tertiary alcohol does not undergo oxidation reaction.  Primary alcohols undergo oxidation to give aldehyde and carboxylic acid as product.  Secondary alcohol undergoes oxidation to give ketone as the product.

Aldehyde undergoes oxidation to give carboxylic acid as the product while ketone does not undergo oxidation reaction.

Tollen’s test:

This is also known as silver mirror test.  The reagent that is used in Tollen’s test is silver nitrate and ammonia in water.  Aldehyde reacts with Tollen’s reagent, where the silver ion is reduced to silver metal and the aldehyde is oxidized to carboxylic acid.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  1

Ketone does not undergo Tollen’s test to deposit silver metal.

Benedict’s test:

This test is also similar to Tollen’s test.  In this test, Cu2+ metal ion is used as oxidizing agent.  The Cu2+ ion is reduced to Cu+ ion while the aldehyde is oxidized to carboxylic acid.  Cu2O is precipitated as brick-red solid.  Ketone does not answer the Benedict’s test.  This is because ketone are not oxidized.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  2

(a)

Expert Solution
Check Mark

Answer to Problem 4.79EP

The inorganic product formed is silver metal.

Explanation of Solution

Aldehydes undergo Tollen’s test.  The product formed when aldehyde undergo oxidation is a carboxylic acid.  The general oxidation reaction for aldehyde can be given as,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  3

Given aldehyde is butanal and the structure can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  4

This on reaction with Tollen’s reagent gives carboxylic acid and silver metal as the product.  The structure of the inorganic product formed and the complete reaction can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  5

Silver metal is formed as the inorganic product when butanal undergoes Tollen’s test.

Conclusion

The inorganic product formed is given.

(b)

Interpretation Introduction

Interpretation:

The inorganic product formed when 2-butanone undergoes Tollen’s test has to be given.

Concept Introduction:

In organic chemistry, oxidation reaction is referred to the number CO bonds increase and/or number of CH bonds decrease.

In organic chemistry, reduction reaction is referred to the number CO bonds decrease and/or number of CH bonds increase.

Alcohols undergo oxidation reaction and reduction reaction.  This depends upon the number of hydrogen atoms that is bonded to the alpha carbon atom.  Primary and secondary alcohol undergoes oxidation reaction while tertiary alcohol does not undergo oxidation reaction.  Primary alcohols undergo oxidation to give aldehyde and carboxylic acid as product.  Secondary alcohol undergoes oxidation to give ketone as the product.

Aldehyde undergoes oxidation to give carboxylic acid as the product while ketone does not undergo oxidation reaction.

Tollen’s test:

This is also known as silver mirror test.  The reagent that is used in Tollen’s test is silver nitrate and ammonia in water.  Aldehyde reacts with Tollen’s reagent, where the silver ion is reduced to silver metal and the aldehyde is oxidized to carboxylic acid.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  6

Ketone does not undergo Tollen’s test to deposit silver metal.

Benedict’s test:

This test is also similar to Tollen’s test.  In this test, Cu2+ metal ion is used as oxidizing agent.  The Cu2+ ion is reduced to Cu+ ion while the aldehyde is oxidized to carboxylic acid.  Cu2O is precipitated as brick-red solid.  Ketone does not answer the Benedict’s test.  This is because ketone are not oxidized.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  7

(b)

Expert Solution
Check Mark

Answer to Problem 4.79EP

No inorganic product is obtained as 2-butanone does not undergo Tollen’s test.

Explanation of Solution

Aldehydes undergo Tollen’s test.  The product formed when aldehyde undergo oxidation is a carboxylic acid.  The general oxidation reaction for aldehyde can be given as,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  8

Given compound is a ketone that is 2-butanone and the structure can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  9

This on reaction with Tollen’s reagent does not give oxidized product.  Therefore, no reaction takes place when 2-butanone reacts with Tollen’s reagent.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  10

No inorganic product is formed when 2-butanone undergoes Tollen’s test.

Conclusion

No reaction takes place when 2-butanone undergoes Tollen’s test.

(c)

Interpretation Introduction

Interpretation:

The inorganic product formed when 3-methylpentanal undergoes Benedict’s test has to be given.

Concept Introduction:

In organic chemistry, oxidation reaction is referred to the number CO bonds increase and/or number of CH bonds decrease.

In organic chemistry, reduction reaction is referred to the number CO bonds decrease and/or number of CH bonds increase.

Alcohols undergo oxidation reaction and reduction reaction.  This depends upon the number of hydrogen atoms that is bonded to the alpha carbon atom.  Primary and secondary alcohol undergoes oxidation reaction while tertiary alcohol does not undergo oxidation reaction.  Primary alcohols undergo oxidation to give aldehyde and carboxylic acid as product.  Secondary alcohol undergoes oxidation to give ketone as the product.

Aldehyde undergoes oxidation to give carboxylic acid as the product while ketone does not undergo oxidation reaction.

Tollen’s test:

This is also known as silver mirror test.  The reagent that is used in Tollen’s test is silver nitrate and ammonia in water.  Aldehyde reacts with Tollen’s reagent, where the silver ion is reduced to silver metal and the aldehyde is oxidized to carboxylic acid.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  11

Ketone does not undergo Tollen’s test to deposit silver metal.

Benedict’s test:

This test is also similar to Tollen’s test.  In this test, Cu2+ metal ion is used as oxidizing agent.  The Cu2+ ion is reduced to Cu+ ion while the aldehyde is oxidized to carboxylic acid.  Cu2O is precipitated as brick-red solid.  Ketone does not answer the Benedict’s test.  This is because ketones are not oxidized.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  12

(c)

Expert Solution
Check Mark

Answer to Problem 4.79EP

The inorganic product formed is Cu2O when 3-methylpentanal undergoes Benedict’s test.

Explanation of Solution

Aldehydes undergo Benedicts’s test.  The product formed when aldehyde undergo oxidation is a carboxylic acid.  The general oxidation reaction for aldehyde can be given as,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  13

Given aldehyde is 3-methylpentanal and the structure can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  14

This on reaction with Tollen’s reagent gives carboxylic acid and Copper(I) oxide as the product.  The inorganic product formed and the complete reaction can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  15

Cu2O is the inorganic product formed when 3-methylpentanal undergoes Benedict’s test.

Conclusion

The inorganic product formed when 3-methylpropanal undergoes Benedict’s test is given.

(d)

Interpretation Introduction

Interpretation:

The inorganic product formed when 3-pentanone undergoes Benedict’s test has to be given.

Concept Introduction:

In organic chemistry, oxidation reaction is referred to the number CO bonds increase and/or number of CH bonds decrease.

In organic chemistry, reduction reaction is referred to the number CO bonds decrease and/or number of CH bonds increase.

Alcohols undergo oxidation reaction and reduction reaction.  This depends upon the number of hydrogen atoms that is bonded to the alpha carbon atom.  Primary and secondary alcohol undergoes oxidation reaction while tertiary alcohol does not undergo oxidation reaction.  Primary alcohols undergo oxidation to give aldehyde and carboxylic acid as product.  Secondary alcohol undergoes oxidation to give ketone as the product.

Aldehyde undergoes oxidation to give carboxylic acid as the product while ketone does not undergo oxidation reaction.

Tollen’s test:

This is also known as silver mirror test.  The reagent that is used in Tollen’s test is silver nitrate and ammonia in water.  Aldehyde reacts with Tollen’s reagent, where the silver ion is reduced to silver metal and the aldehyde is oxidized to carboxylic acid.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  16

Ketone does not undergo Tollen’s test to deposit silver metal.

Benedict’s test:

This test is also similar to Tollen’s test.  In this test, Cu2+ metal ion is used as oxidizing agent.  The Cu2+ ion is reduced to Cu+ ion while the aldehyde is oxidized to carboxylic acid.  Cu2O is precipitated as brick-red solid.  Ketone does not answer the Benedict’s test.  This is because ketones are not oxidized.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  17

(d)

Expert Solution
Check Mark

Answer to Problem 4.79EP

No inorganic product is formed when 3-pentanone undergoes Benedict’s test.

Explanation of Solution

Aldehydes undergo Benedict’s test.  The product formed when aldehyde undergo oxidation is a carboxylic acid.  The general oxidation reaction for aldehyde can be given as,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  18

Given compound is a ketone.  The name of ketone is 3-pentanone and the structure can be given as shown below,

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  19

This on reaction with Benedict’s reagent does not give oxidized product.  Therefore, no reaction takes place when 3-pentanone undergoes Benedict’s test.

Organic And Biological Chemistry, Chapter 4, Problem 4.79EP , additional homework tip  20

No inorganic product is formed when 3-pentanone undergo Benedict’s test.

Conclusion

No reaction takes place when 3-pentanone undergoes Benedict’s test.

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Chapter 4 Solutions

Organic And Biological Chemistry

Ch. 4.4 - Prob. 3QQCh. 4.4 - Prob. 4QQCh. 4.4 - Prob. 5QQCh. 4.5 - Prob. 1QQCh. 4.5 - Prob. 2QQCh. 4.5 - Prob. 3QQCh. 4.5 - Prob. 4QQCh. 4.5 - Prob. 5QQCh. 4.6 - Prob. 1QQCh. 4.6 - Prob. 2QQCh. 4.6 - Prob. 3QQCh. 4.7 - Prob. 1QQCh. 4.7 - Prob. 2QQCh. 4.8 - Prob. 1QQCh. 4.8 - Prob. 2QQCh. 4.9 - Prob. 1QQCh. 4.9 - Prob. 2QQCh. 4.10 - Prob. 1QQCh. 4.10 - Prob. 2QQCh. 4.10 - Prob. 3QQCh. 4.10 - Prob. 4QQCh. 4.11 - Prob. 1QQCh. 4.11 - Prob. 2QQCh. 4.11 - Prob. 3QQCh. 4.11 - Prob. 4QQCh. 4.11 - Prob. 5QQCh. 4.12 - Prob. 1QQCh. 4.12 - Prob. 2QQCh. 4 - Prob. 4.1EPCh. 4 - Prob. 4.2EPCh. 4 - Prob. 4.3EPCh. 4 - In terms of polarity, which carbonyl group atom...Ch. 4 - Prob. 4.5EPCh. 4 - Prob. 4.6EPCh. 4 - Prob. 4.7EPCh. 4 - Prob. 4.8EPCh. 4 - Prob. 4.9EPCh. 4 - Prob. 4.10EPCh. 4 - Prob. 4.11EPCh. 4 - Classify each of the following structures as an...Ch. 4 - Prob. 4.13EPCh. 4 - Prob. 4.14EPCh. 4 - Prob. 4.15EPCh. 4 - Prob. 4.16EPCh. 4 - Prob. 4.17EPCh. 4 - Prob. 4.18EPCh. 4 - Prob. 4.19EPCh. 4 - Prob. 4.20EPCh. 4 - Prob. 4.21EPCh. 4 - Prob. 4.22EPCh. 4 - Prob. 4.23EPCh. 4 - Prob. 4.24EPCh. 4 - Prob. 4.25EPCh. 4 - Prob. 4.26EPCh. 4 - Prob. 4.27EPCh. 4 - Prob. 4.28EPCh. 4 - Name the functional group(s) present in each of...Ch. 4 - Prob. 4.30EPCh. 4 - Prob. 4.31EPCh. 4 - Prob. 4.32EPCh. 4 - Prob. 4.33EPCh. 4 - Prob. 4.34EPCh. 4 - Prob. 4.35EPCh. 4 - Prob. 4.36EPCh. 4 - Draw a structural formula for each of the...Ch. 4 - Prob. 4.38EPCh. 4 - Prob. 4.39EPCh. 4 - Prob. 4.40EPCh. 4 - Draw a structural formula for each of the...Ch. 4 - Prob. 4.42EPCh. 4 - Prob. 4.43EPCh. 4 - Name the functional group(s) present in each of...Ch. 4 - Prob. 4.45EPCh. 4 - Prob. 4.46EPCh. 4 - Prob. 4.47EPCh. 4 - Prob. 4.48EPCh. 4 - Prob. 4.49EPCh. 4 - Give IUPAC names for all saturated...Ch. 4 - Prob. 4.51EPCh. 4 - Prob. 4.52EPCh. 4 - Prob. 4.53EPCh. 4 - Prob. 4.54EPCh. 4 - Prob. 4.55EPCh. 4 - Prob. 4.56EPCh. 4 - Prob. 4.57EPCh. 4 - Prob. 4.58EPCh. 4 - Prob. 4.59EPCh. 4 - Prob. 4.60EPCh. 4 - Prob. 4.61EPCh. 4 - Prob. 4.62EPCh. 4 - Prob. 4.63EPCh. 4 - Prob. 4.64EPCh. 4 - Which member in each of the following pairs of...Ch. 4 - Prob. 4.66EPCh. 4 - Which member in each of the following pairs of...Ch. 4 - Prob. 4.68EPCh. 4 - Prob. 4.69EPCh. 4 - How many hydrogen bonds can form between an...Ch. 4 - Prob. 4.71EPCh. 4 - Prob. 4.72EPCh. 4 - Draw the structure of the alcohol needed to...Ch. 4 - Prob. 4.74EPCh. 4 - Prob. 4.75EPCh. 4 - Prob. 4.76EPCh. 4 - Prob. 4.77EPCh. 4 - Prob. 4.78EPCh. 4 - Prob. 4.79EPCh. 4 - Prob. 4.80EPCh. 4 - Prob. 4.81EPCh. 4 - Which of the following compounds would react with...Ch. 4 - Prob. 4.83EPCh. 4 - Prob. 4.84EPCh. 4 - Which of the three compounds pentanal,...Ch. 4 - Prob. 4.86EPCh. 4 - Prob. 4.87EPCh. 4 - Prob. 4.88EPCh. 4 - Prob. 4.89EPCh. 4 - Prob. 4.90EPCh. 4 - Prob. 4.91EPCh. 4 - Indicate whether each of the following compounds...Ch. 4 - Which carbon atom is the hemiacetal carbon atom in...Ch. 4 - Which carbon atom is the hemiacetal carbon atom in...Ch. 4 - Prob. 4.95EPCh. 4 - Prob. 4.96EPCh. 4 - Prob. 4.97EPCh. 4 - Prob. 4.98EPCh. 4 - Prob. 4.99EPCh. 4 - Indicate whether each of the following compounds...Ch. 4 - Prob. 4.101EPCh. 4 - Prob. 4.102EPCh. 4 - Prob. 4.103EPCh. 4 - Prob. 4.104EPCh. 4 - Prob. 4.105EPCh. 4 - Prob. 4.106EPCh. 4 - Prob. 4.107EPCh. 4 - Name each of the compounds in Problem 15-106 in...Ch. 4 - Prob. 4.109EPCh. 4 - Prob. 4.110EPCh. 4 - Prob. 4.111EPCh. 4 - Prob. 4.112EPCh. 4 - Prob. 4.113EPCh. 4 - Prob. 4.114EPCh. 4 - Prob. 4.115EPCh. 4 - Prob. 4.116EPCh. 4 - Prob. 4.117EPCh. 4 - Prob. 4.118EP
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