Draw two cyclic constitutional isomers of
cis-1,2-dichlorocyclopropane
with the same size ring. Does cis or trans apply to this structure,
or only to hexane structures? I don't believe there is only one
constitutional isomer for this which would be a triangle with two
Cl on the same carbon. Is this correct?
Answer
Constitutional isomers are all isomers with the same chemical
formula as 1,2-dichlorocyclopropane (no matter of cis or
trans).
The two possible constitutional isomers with same ring size is
-
The Cis and Trans isomers are as shown below-
Cyclopropane is achiral, and so is
cis-1,2-dichlorocyclopropane.
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Yes, this is correct. There are several constitutional isomers
of cis-1,2-dichlorocyclopropane, but the question
is asking only about the isomers having SAME SIZE
RING. So, only two constitutional isomers are
possible.
Otherwise there are other constitutional isomers as shown below
-
There are 5 possibilities for the formula
C3H4Cl2
1,1-dichloro 1-pentene
1,2-dichloro 1-pentene (has also cis/trans isomers)
1,3-dichloro 1-pentene (has also cis/trans isomers)
2,3-dichloro 1-pentene and
3,3-dichloro 1-pentene