The two possible structures for the β -D-aldohexose are to be distinguished. Concept Introduction: The Wohl-degradation is opposite of the Killiani-Fisher synthesis. It shortens an aldoses chain by one carbon. Hexoses are converted to pentoses and pentoses are converted to tetroses. Aldehyde group reacts with hydroxylamine to form an oxime. It is heated with acetic anhydride to dehydrate the oxime forming a cyano group and all the hydroxyl groups are converted to esters. All the ester groups are hydrolyzed in a basic aqueous solution and the cyano group is eliminated.

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 20, Problem 48P

Interpretation Introduction

Interpretation:

The two possible structures for the β-D-aldohexose are to be distinguished.

Concept Introduction:

The Wohl-degradation is opposite of the Killiani-Fisher synthesis. It shortens an aldoses chain by one carbon. Hexoses are converted to pentoses and pentoses are converted to tetroses. Aldehyde group reacts with hydroxylamine to form an oxime. It is heated with acetic anhydride to dehydrate the oxime forming a cyano group and all the hydroxyl groups are converted to esters. All the ester groups are hydrolyzed in a basic aqueous solution and the cyano group is eliminated.

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When 15.00 mL of 3.00 M NaOH was mixed in a calorimeter with 12.80 mL of 3.00 M HCl, both initially at room temperature (22.00 C), the temperature increased to 29.30 C. The resultant salt solution had a mass of 27.80 g and a specific heat capacity of 3.74 J/Kg. What is heat capacity of the calorimeter (in J/C)? Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ/mol.

When 15.00 mL of 3.00 M NaOH was mixed in a calorimeter with 12.80 mL of 3.00 M HCl, both initially at room temperature (22.00 C), the temperature increased to 29.30 C. The resultant salt solution had a mass of 27.80 g and a specific heat capacity of 3.74 J/Kg. What is heat capacity of the calorimeter (in J/C)? Note: The molar enthalpy of neutralization per mole of HCl is -55.84 kJ/mol. Which experimental number must be initialled by the Lab TA for the first run of Part 1 of the experiment? a) the heat capacity of the calorimeter b) Mass of sample c) Ti d) The molarity of the HCl e) Tf

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Answer 2

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 20, Problem 48P

Interpretation Introduction

Interpretation:

The two possible structures for the β-D-aldohexose are to be distinguished.

Concept Introduction:

The Wohl-degradation is opposite of the Killiani-Fisher synthesis. It shortens an aldoses chain by one carbon. Hexoses are converted to pentoses and pentoses are converted to tetroses. Aldehyde group reacts with hydroxylamine to form an oxime. It is heated with acetic anhydride to dehydrate the oxime forming a cyano group and all the hydroxyl groups are converted to esters. All the ester groups are hydrolyzed in a basic aqueous solution and the cyano group is eliminated.

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Answer 3

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 20, Problem 48P

Interpretation Introduction

Interpretation:

The two possible structures for the β-D-aldohexose are to be distinguished.

Concept Introduction:

The Wohl-degradation is opposite of the Killiani-Fisher synthesis. It shortens an aldoses chain by one carbon. Hexoses are converted to pentoses and pentoses are converted to tetroses. Aldehyde group reacts with hydroxylamine to form an oxime. It is heated with acetic anhydride to dehydrate the oxime forming a cyano group and all the hydroxyl groups are converted to esters. All the ester groups are hydrolyzed in a basic aqueous solution and the cyano group is eliminated.

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Check out a sample textbook solution

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Answer 4

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 20, Problem 48P

Interpretation Introduction