1.draw a geometric isomer of butene.
2.draw a geometric isomer of 2butene.
Geometric Isomerism
Geometric isomerism occurs when substances have the same molecular formula, but a different arrangement of their atoms in space. There are three ways that this can happen:
An interesting example of geometric isomerism caused by rings is found in sugars such as glucose, fructose, mannose and galactose.
Below are models of the geometric isomers of 1 butene and 2butene. 1Butene does not form geometric isomers, even though it has a C=C bond, because one of the doublebonded carbon atoms has two identical groups on it (hydrogen atoms in this case). 2Butene does form geometric isomers because each doublebonded carbon atom has two different groups on it. The cis and trans prefixes are used to differentiate the positions of the functional groups.
cis1butene 
trans2butene 
Where like groups are on the same side of the double bond, we call it a cis isomer; where they are on opposite sides we call it atrans isomer. 
1butene 
Although 1butene contains a C=C bond, 

Get Answers For Free
Most questions answered within 1 hours.