Organic Chemistry: A Guided Inquiry
Organic Chemistry: A Guided Inquiry
2nd Edition
ISBN: 9780618974122
Author: Andrei Straumanis
Publisher: Cengage Learning
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Chapter 5, Problem 6E

(a)

Interpretation Introduction

Interpretation:The resonance structure that results from curved arrows mentioned below should be determined.

  Organic Chemistry: A Guided Inquiry, Chapter 5, Problem 6E , additional homework tip  1

Concept introduction:When one single structure is unable to describe all the properties of single molecule, a phenomenon called resonance comes into play. This arises when two or more than two Lewis structures are possible for one molecule. All such structures are called resonating structures and have same placement of atoms in them but these have different locations of bond pairs and lone pairs. The resonating structures are inter-convertible with each other. The resultant of all the resonating or contributing structures is called the resonance hybrid.

Rules to form resonance structure are as follows:

1. Use arrow types 1 and 2 for resonance structure of anions in movement of negative charge. Arrow type 1 shows the movement of lone pair toward adjacent atom and then converted into π bond. Arrow type 2 shows the movement of π electron pair from double bond towards adjacent carbon and then converted into lone pair.

2. Use only arrow type 3 to move a positive charge for resonance structure of cations. Arrow type 3 is used to move π electron pair towards adjacent single bonds.

3. The sigma bond should not be broken. Any atom must not move from its place and total number of electrons must be same in all resonance structures.

(b)

Interpretation Introduction

Interpretation:Whether the use of arrow type 3 in resonance structure of anion skips the important resonance structure or not should be determined.

Concept introduction:When one single structure is unable to describe all the properties of single molecule, a phenomenon called resonance comes into play. This arises when two or more than two Lewis structures are possible for one molecule. All such structures are called resonating structures and have same placement of atoms in them but these have different locations of bond pairs and lone pairs. The resonating structures are inter-convertible with each other. The resultant of all the resonating or contributing structures is called the resonance hybrid.

Rules to form resonance structure are as follows:

1. Use arrow types 1 and 2 for resonance structure of anions in movement of negative charge. Arrow type 1 shows the movement of lone pair toward adjacent atom and then converted into π bond. Arrow type 2 shows the movement of π electron pair from double bond towards adjacent carbon and then converted into lone pair.

2. Use only arrow type 3 to move a positive charge for resonance structure of cations. Arrow type 3 is used to move π electron pair towards adjacent single bonds.

3. The sigma bond should not be broken. Any atom must not move from its place and total number of electrons must be same in all resonance structures.

(c)

Interpretation Introduction

Interpretation: The curved arrowsin the resonance structure mentioned below should be added.

  Organic Chemistry: A Guided Inquiry, Chapter 5, Problem 6E , additional homework tip  2

Concept introduction:When one single structure is unable to describe all the properties of single molecule, a phenomenon called resonance comes into play. This arises when two or more than two Lewis structures are possible for one molecule. All such structures are called resonating structures and have same placement of atoms in them but these have different locations of bond pairs and lone pairs. The resonating structures are inter-convertible with each other. The resultant of all the resonating or contributing structures is called the resonance hybrid.

Rules to form resonance structure are as follows:

1. Use arrow types 1 and 2 for resonance structure of anions in movement of negative charge. Arrow type 1 shows the movement of lone pair toward adjacent atom and then converted into π bond. Arrow type 2 shows the movement of π electron pair from double bond towards adjacent carbon and then converted into lone pair.

2. Use only arrow type 3 to move a positive charge for resonance structure of cations. Arrow type 3 is used to move π electron pair towards adjacent single bonds.

3. The sigma bond should not be broken. Any atom must not move from its place and total number of electrons must be same in all resonance structures.

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Organic Chemistry: A Guided Inquiry

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ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Cengage Learning