Chem 30B Homework 1 (key)
Name __________________
1. Name the following structures.
CH3
CH3 CH2 CH
CH3 CH2 CH2 CH CH3
CH CH3
CH2
CH3
CH3
2,3 – dimethyl pentane
Name
3 – methyl hexane
Name
Cl
CH3
CH2 CH2 CH2 CH CH3
CH2
CH3
methyl cyclohexane
Name
CH3
1 – chloro – 4 – methyl hexane
Name
CH3
CH3
Cl
CH
H3C
CH2 CH2 CH2 CH
CH2 CH2 CH CH2 CH2
CH CH2 CH2 CH2
CH2
CH2
CH3
CH3
1 – chloro – 4 – ethyal – 5 – isopropyl octane
Name
2. Draw the structure of the following molecules.
a. 1,1-dimethyl cyclohexane.
CH3
CH3
b. 2,2-dimethyl octane
CH3
CH3 C
CH2CH2CH2CH2CH2CH3
CH3
c.
4-ethyl-2,2,3-trimethyl nonane
CH3 CH3
CH3 C
CH3
CH
CH
CH2CH2CH2CH2CH3
CH2CH3
4 – methyl octane
Name
3. Rank the following molecules from lowest to highest in terms of boiling point.
CH3
CH3
CH3
CH3
CH
CH
CH3
CH3
CH2
CH2
CH3
CH4
CH3
A
B
Lowest
__D__
C
__A__
__C__
__B__
D
Highest
4. Determine the molecular formula for the following compounds. Write answer in space
provided.
C4H10
__________
C5H10
__________
C6H14
__________
C6H12
__________
C 2H 6
__________
5. Draw four structural isomers of C6H14. Include all hydrogen atoms.
CH3
CH3 CH2 CH2 CH2 CH2 CH3
CH3 CH2 CH
CH3
CH2 CH3
CH3 CH
CH
CH3
CH3
CH3 CH
CH3
CH2 CH2 CH3
CH3 C
CH2 CH3
CH3
6. Write out the balanced combustion reaction for methane, ethane, and heptane.
Methane:
CH4 + 2 O2 → CO2 + 2 H2O
Ethane:
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
Heptane:
2 C7H16 + 22 O2 → 14 CO2 + 16 H2O
CH3