Draw two cyclic constitutional isomers of cis-1. 2-dichlorocyclopropane with the same size ring.

Draw two cyclic constitutional isomers of
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?


Constitutional isomers are all isomers with the same chemical
formula as 1,2-dichlorocyclopropane (no matter of cis or

The two possible constitutional isomers with same ring size is

The Cis and Trans isomers are as shown below-

Cl Cl Cl cis-1,2-dichlorocyclopropane trans-1,2-dichlorocyclopropane

Cyclopropane is achiral, and so is

carnot interconvert trans isomer CI


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
So, only two constitutional isomers are

Otherwise there are other constitutional isomers as shown below

There are 5 possibilities for the formula
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

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