1

CH 201
Exam #1
Sept. 22, 1997

Name ______________________________

Page

Points

1

______(12)

2

______(27)

3

______(16)

4

______(19)

5

______(14)

6

______(12)

Total

______(100)

1. Write the molecular formula for each of the following compounds on the line below them (6 pts).

O

OCH2CH3

O

NHCH3

Br

H3C

O

O

O

CH3

(b) Write the functional group present in each of the following molecules. (6 pts)

CH2

O

OCH2CH3

O

NHCH3

H3C

CH2

OH

O

CH2

CH3

2. Draw Lewis structures for the following compounds, show all unshared electrons. (12 pts)

2

H

C

H

H

N

C

O

N

C

C

C

N

H

H

H

N

H

C

O

N

H

H

3. a. Assign formal charges for the atoms other than hydrogen I each of the following molecules: (4 pts)

N

N

N

H2
C

H3C

N

O

O

b. Write Lewis structures for the following ions, show all unshared electrons and put formal charges on
atoms that have them (8 pts).

C

N

O

C

O

O

-

-2

4. Circle the strongest Lewis base and explain why it is. (3 pts)

N

N

5. What are the atomic orbitals used to form the indicated sigma bonds in each of the following
molecules:(8 pts)

3

H3C

C

O

CH3

O

C
H2

H2
C

C
H2

OCH3

O

H

O

H

H

6. In each of the following pairs of molecules label the bond indicated by an arrow as shorter or longer.
(6 pts)

H3C

CH2

CH3

H3C

H
C

CH2

H

C

C

CH3

C

C

H

H

H

CH3

C

O

H

CH3

CH

OH

H

CH3

7. What is the C-C-C bond angle in the following molecules. (2 pts)

H2C

C

CH2

8. For each of the following anions draw a resonance structure using curved arrows to show electron
movement. Then circle the mostimportant contributor. (8 pts)