The relative pK a values of cyclopentadiene and cycloheptatriene have to be estimated. Concept Introduction: Criteria for Aromaticity : 1. A molecule must be cyclic. 2. Every atom in the ring must have a p-orbital. 3. The molecule must be planar. 4. π- Cloud must contain an odd number of pairs of π-electrons .

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Answer 1

Question

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

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(c) The following data have been obtained for the hydrolysis of sucrose, C12H22O11, to glucose, C6H12O6, and fructose C6H12O6, in acidic solution: C12H22O11 + H2O → C6H12O6 + C6H12O6 [sucrose]/mol dm³ t/min 0 0.316 14 0.300 39 0.274 60 0.256 80 0.238 110 0.211 (i) Graphically prove the order of the reaction and determine the rate constant of the reaction. (ii) Determine the half-life, t½ for the hydrolysis of sucrose.

(III) adsorbent (b) Adsorption of the hexacyanoferrate (III) ion, [Fe(CN)6] ³, on y-Al2O3 from aqueous solution was examined. The adsorption was modelled using a modified Langmuir isotherm, yielding the following values of Kat pH = 6.5: (ii) T/K 10-10 K 280 2.505 295 1.819 310 1.364 325 1.050 Determine the enthalpy of adsorption, AadsHⓇ. If the reported value of entropy of adsorption, Aads Se = 146 J K-1 mol-1 under the above conditions, determine Aads Gº.

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Answer 2

Question

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

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Answer 3

Question

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

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Answer 4

Question

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

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Answer 5

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

Answer 6

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

Answer 7

Chapter 8.11, Problem 18P

a)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopentadiene and cycloheptatriene have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

1. A molecule must be cyclic.

2. Every atom in the ring must have a p-orbital.

3. The molecule must be planar.

4. π- Cloud must contain an odd number of pairs of π-electrons.

Answer 8

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

Answer 9

b)

Interpretation Introduction

Interpretation: The relative pKa values of cyclopropene and cyclopropane have to be estimated.

Concept Introduction:

Criteria for Aromaticity:

5. A molecule must be cyclic.

6. Every atom in the ring must have a p-orbital.

7. The molecule must be planar.

8. π- Cloud must contain an odd number of pairs of π-electrons.

Answer 10

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Answer 11

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Answer 12

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Answer 13

Ch. 8.1 - Prob. 1P Ch. 8.1 - Prob. 2P Ch. 8.4 - Prob. 3P Ch. 8.5 - Prob. 5P Ch. 8.6 - a. Predict the relative bond lengths of the three...Ch. 8.6 - Prob. 7P Ch. 8.6 - Prob. 8P Ch. 8.8 - Prob. 9P Ch. 8.9 - Prob. 10P Ch. 8.9 - Prob. 12P

Solution Summary: The author explains that the relative values of cyclopentadiene and heptatriene must be estimated. The conjugate base is stabilized by its aromaticity.

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