easy organic chem

1.)Can each of the following compounds exhibit geometric isomerism (cis-, trans-)?
Just answer each by (Yes or No)

1,1-dimethylcyclohexane
1-heptene
1,2-dichlorocyclopentane
3-ethyl-2-pentene
3-heptene
2,3-dimethylcyclopentene
3-ethyl-2-hexene


2.)The correct IUPAC name for the compound represented in the Newman projection shown above is:
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http://picasaweb.google.com/110376515801820978243/Problem2#


a.)4,4-dichloro-3-methylbutane

b.)2,3-dichloro-2-methylbutane

c.)1,1-dichloro-2-methylpropane

d.)2,2-dichloro-2-ethylbutane

e.)2,2-dichloro-3-methylbutane

f.)1,1-dichloro-2-methylbutane

3.)Which one of these compounds can exhibit optical isomerism?

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http://picasaweb.google.com/110376515801820978243/Question3#

a)
b.)
c.)
d.)
e.)
f.)

4.)How many different structural isomers exist with the formula C6H14 (Ignore geometric and optical isomers):
a.)9
b.)7
c.)3
d.)1
e.)5