Question

1.draw a geometric isomer of butene. 2.draw a geometric isomer of 2-butene.

1.draw a geometric isomer of butene.

2.draw a geometric isomer of 2-butene.

Homework Answers

Answer #1

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:

  • where there is a C=C bond in the molecule;
  • where a molecule has rings; or
  • where there is a >C=N bond.

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 2-butene. 1-Butene does not form geometric isomers, even though it has a C=C bond, because one of the double-bonded carbon atoms has two identical groups on it (hydrogen atoms in this case). 2-Butene does form geometric isomers because each double-bonded carbon atom has two different groups on it. The cis- and trans- prefixes are used to differentiate the positions of the functional groups.

cis-1-butene

trans-2-butene

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.

1-butene

Although 1-butene contains a C=C bond,
it does not form geometrical isomers.

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