Chapter 1, Problem 1.43P

Draw one valid Lewis structure for each compound. Assume the atoms are arranged as drawn.

Interpretation Introduction

(a)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${\text{CH}}_{\text{2}}{\text{N}}_{\text{2}}$. The atoms are arranged as,

Figure 1

The valence electrons are counted as,

$\begin{array}{l}\left(1\text{C}\times 4{\text{e}}^{-}\right)+\left(\text{2H}\times 1{\text{e}}^{-}\right)+\left(\text{2N}\times 5{\text{e}}^{-}\right)\\ =4{\text{e}}^{-}+2{\text{e}}^{-}+10{\text{e}}^{-}\\ =16{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 2

Conclusion

The valid Lewis structure for the given compound is shown in Figure 2.

Interpretation Introduction

(b)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${\text{CH}}_3\text{CNO}$. The atoms are arranged as,

Figure 3

The valence electrons are counted as,

$\begin{array}{l}\left(\text{2C}\times 4{\text{e}}^{-}\right)+\left(\text{3H}\times 1{\text{e}}^{-}\right)+\left(\text{1N}\times 5{\text{e}}^{-}\right)+\left(\text{1O}\times 6{\text{e}}^{-}\right)\\ =8{\text{e}}^{-}+3{\text{e}}^{-}+5{\text{e}}^{-}+6{\text{e}}^{-}\\ =22{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 4

Conclusion

The valid Lewis structure for the given compound is shown in Figure 4.

Interpretation Introduction

(c)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${\text{CH}}_3{\text{NO}}_2$. The atoms are arranged as,

Figure 5

The valence electrons are counted as,

$\begin{array}{l}\left(\text{1C}\times 4{\text{e}}^{-}\right)+\left(\text{3H}\times 1{\text{e}}^{-}\right)+\left(\text{1N}\times 5{\text{e}}^{-}\right)+\left(\text{2O}\times 6{\text{e}}^{-}\right)\\ =4{\text{e}}^{-}+3{\text{e}}^{-}+5{\text{e}}^{-}+12{\text{e}}^{-}\\ =24{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 6

Conclusion

The valid Lewis structure for the given compound is shown in Figure 6.

Interpretation Introduction

(d)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${\text{HCO}}_2^{-}$. The atoms are arranged as,

Figure 7

The valence electrons are counted as,

$\begin{array}{l}\left(\text{1C}\times 4{\text{e}}^{-}\right)+\left(\text{1H}\times 1{\text{e}}^{-}\right)+\left(\text{2O}\times 6{\text{e}}^{-}\right)\\ =4{\text{e}}^{-}+1{\text{e}}^{-}+12{\text{e}}^{-}\\ =17{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 8

Conclusion

The valid Lewis structure for the given compound is shown in Figure 8.

Interpretation Introduction

(e)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${\text{HCO}}_3^{-}$. The atoms are arranged as,

Figure 9

The valence electrons are counted as,

$\begin{array}{l}\left(\text{1C}\times 4{\text{e}}^{-}\right)+\left(\text{1H}\times 1{\text{e}}^{-}\right)+\left(\text{3O}\times 6{\text{e}}^{-}\right)\\ =4{\text{e}}^{-}+1{\text{e}}^{-}+18{\text{e}}^{-}\\ =23{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 10

Conclusion

The valid Lewis structure for the given compound is shown in Figure 10.

Interpretation Introduction

(f)

Interpretation: A valid Lewis structure for the given compound is to be drawn.

Concept introduction: The arrangement of valence electrons among the atoms present in a molecule is represented by the Lewis structure of that molecule. The electron pairs in the molecule are considered to be delocalized.

Answer to Problem 1.43P

The valid Lewis structure for the given compound is,

Explanation of Solution

The given compound is ${}^{-}{\text{CH}}_2\text{CN}$. The atoms are arranged as,

Figure 11

The valence electrons are counted as,

$\begin{array}{l}\left(\text{2C}\times 4{\text{e}}^{-}\right)+\left(\text{2H}\times 1{\text{e}}^{-}\right)+\left(\text{1N}\times 5{\text{e}}^{-}\right)\\ =8{\text{e}}^{-}+2{\text{e}}^{-}+5{\text{e}}^{-}\\ =15{\text{e}}^{-}\end{array}$

The bonds and lone pairs are added in the given arrangement of atoms. The valid Lewis structure is,

Figure 12

Conclusion

The valid Lewis structure for the given compound is shown in Figure 12.