Self Quiz Answers

CH 106 - Lesson 2

Self Quiz Answers

Select the letter of the best answer for each of the questions (1-5) below.

1. What kind of hybridization does the center (#2) carbon atom in this molecule have?

H
|
H-C-CşC-H
|
H

a. s
*b. sp
c. sp²
d. sp³
e. sp⁴

2. Which of the following structural features is associated with alkenes?

a. C-to-C single bond
*b. C-to-C double bond
c. C-to-C triple bond
d. benzene ring
e. halogen bonded to C

3. What kind of reaction is this?

H H
| |
H-C=C-H

+ HBr žŽ

H H
| |
H-C-C-H
| |
H Br

*a. addition
b. oxidation
c. polymerization
d. substitution
e. subtraction

4. What is the name of this compound?

H   H       H
|   |       |
H - C - C = C - C - H
|       |   |
H     H-C-H H
|
    H

a. pentene
b. isopentene
*c. 2-methyl-2-butene
d. 2-methyl-3-butene
e. 3-methyl-3-butene

5. What kind of compound would have an IR spectrum similar to the one shown here?

IR spectrum for self quiz question number 5. [sq2no5ir.jpg]

a. alkane
b. alkene
*c. alkyne

Answer the following questions (6-10).

6. Classify and name this compound.

    H
    |
H-CşC-C-H
    |
    H

An alkyne, 1-propyne (or simply propyne in this case).

7. What kind of reaction is this?

n CH₃CH=CH₂ Ž

é
ę
ę
ę
ę
ę
ë

CH₃H
|   |
- C - C -
|   |
H   H

ů
ú
ú
ú
ú
ú
ű n

Polymerization, specifically addition polymerization.

8. What is a pi (p) bond?

A pi bond is a bond in which electrons are shared in a region off to the side of a line connecting the centers of the bonded atoms. It is fromed by the sideways overlap of two p orbitals.

9. What is the structural formula for para-dichlorobenzene?

Structure of p-dichlorobenzene. [sq2ans9.jpg]

10. What is the laboratory test for an alkene?

Test it with bromine to see if it decolorizes bromine. (Note: Some other compounds, such as alkynes, will also decolorize bromine. The use of IR spectra will also aid in their identification.)

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