(a) Interpretation: The explanation as to why 2, 4-pentanedione contains much less enol form in water ( 15 % ) than it does in hexane ( 92% ) is to be stated. Concept introduction: Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

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Answer 1

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Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

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Predicting the qualitative acid-base properties of salts Consider the following data on some weak acids and weak bases: base acid Κα Kb name formula name formula hydrocyanic acid - 10 HCN 4.9 × 10 pyridine C₂H₂N 1.7 × 10 9 acetic acid HCH3CO2 1.8 × 10 5 hydroxylamine HONH2 1.1 × 10¯ 8 Use this data to rank the following solutions in order of increasing pH. In other words, select a '1' next to the solution that will have the lowest pH, a '2' next to the solution that will have the next lowest pH, and so on. 0.1 M KCN solution pH choose one ✓ 0.1 M C5H5NHCI choose one ✓ 0.1 M NaCH3CO2 choose one ✓ 0.1 M HONH3Br ✓ choose one 1 (lowest) 2 3 4 (highest)

For this question please solve the first question. Please explain your thought process, the steps you took, and how you would tackle a similar problem. Thank you for your help!

Part C A solution that is 0.040 M in HCIO4 and 0.046 M in HCI Express your answer numerically to two decimal places. ΜΕ ΑΣΦ ? pH = Submit Request Answer Part D A solution that is 1.08% HCl by mass (with a density of 1.01 g/mL) Express your answer numerically to three decimal places. ΜΕ ΑΣΦ -> 0 ? pH =

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 ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

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Answer 3

Question

Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

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Answer 4

Question

Definition Definition Organic compounds that have a carbonyl group, C = O, as their functional group. The carbonyl group in ketones is placed somewhere in the middle of the molecular structure, which means, the C=O is attached to two alkyl groups or benzene rings. Just like all other homologous series, the naming of ketones is done using a common suffix “-one”. The general molecular formula is C n H 2n O. Functional group of a ketone

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

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Answer 5

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

Answer 6

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Answer 7

Chapter 22, Problem 22.10P

Interpretation Introduction

(a)

Interpretation:

The explanation as to why 2, 4-pentanedione contains much less enol form in water (15%) than it does in hexane (92%) is to be stated.

Concept introduction:

Ketone also exists in two forms which are commonly known as keto-enol tautomerism. Tautomers are isomers which differ only in the position of the protons and electrons of the double bond of the electronegative atom in the compound. There is no change in the carbon skeleton of the compound. This phenomenon which involves simple proton transfer in an intramolecular fashion is known as tautomerism.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The explanation as to why 2, 4-pentanedione has a strong UV absorption in hexane solvent (λmax=272 nm,∈=12,000), but a weaker absorption in water (λmax=274 nm,∈=2050) is to be stated.

Concept introduction:

In keto-enol tautomerism, the keto-enol forms of a compound are present in equilibrium with each other. Keto and enol forms both are tautomers of each other, they are inter-convertible to each other by the transfer of α- hydrogen. In UV-Visible spectroscopy, more the conjugation present in the compound, absorption of longer wavelength takes place.

Answer 10

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Answer 11

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Answer 13

Ch. 22 - Prob. 22.1P Ch. 22 - Prob. 22.2P Ch. 22 - Prob. 22.3P Ch. 22 - Prob. 22.4P Ch. 22 - Prob. 22.5P Ch. 22 - Prob. 22.6P Ch. 22 - Prob. 22.7P Ch. 22 - Prob. 22.8P Ch. 22 - Prob. 22.9P Ch. 22 - Prob. 22.10P

Solution Summary: The author explains why 2, 4-pentanedione contains less enol form in water than it does in hexan.

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