NAME _____________________
Chem 311 002
Quiz 3 Fall
2001
1. Name/Draw the
following:
c. _______________ d.
_________________ e. _______________________
2. The boiling points increase with ( increased, decreased )
molecular weight by
____degrees/CH2
group. Increased branching in similar MW isomers
( increases, decreases ) boiling point. Explain this last
statement.
3. Draw all 8 structural isomers
of pentyl group and name 4 of them.
4. Draw the sawhorse and Newman projections and clearly indicate
the dihedral
angles of the most stable conformer of butane.
5. Write three completely balanced reactions of cyclobutane
using one mole of
reactant:
6. Complete the following combustion data table and fill in each
line:
Total
Heat Combust. __________ __________
Strain Energy
cyclopropane
499 kcal/mole 166 kcal/mole
9.2
kcal/mole 27.6
kcal/mole
Cyclobutane
655.9
___
___
___
cyclohexane
944
___
___
___
linear alkanes
___
___
___
7. Include the name of the fraction and the use for each bp
range alkane
b.p.
range
# C=s
fraction
Use
<30o C
2-4 __________________ _________________
30-180 4-9 __________________ _________________
160-230
8-16 ___________________
__________________
200-300
10-18
diesel fuel
motor fuel
8. Which of the following
cycloalkanes are capable of (cis-trans) isomerism? Draw
the cis and trans isomers.
a. 3-ethyl-1,1-dimethylcyclohexane b. 1,4-dimethylcyclohexane
c. 1-ethyl-3-methylcyclopentane
d.
1-cylopropyl-2-methylcyclohexane
9. Draw the two conformers
of trans-1-methyl-2-t-butylcyclohexane and indicate
the most stable conformer. Explain your answer.
10. Explain why the 1,3-diaxial interactions are so important in
determining the
most stable conformers in substituted cyclohexanes.