


Understanding Cis and Trans Molecular Geometry in Organic Chemistry
In chemistry, the prefix "cis-" indicates that two functional groups are on the same side of a molecule. This is in contrast to the prefix "trans-", which indicates that the functional groups are on opposite sides of the molecule.
For example, consider a molecule with two hydroxyl (-OH) groups attached to a carbon atom. If both hydroxyl groups are on the same side of the carbon atom, the molecule is said to be cis-. If one hydroxyl group is on one side of the carbon atom and the other is on the opposite side, the molecule is said to be trans-.
The prefix "cis-" is derived from the Latin word "cis", which means "on this side". It is commonly used in organic chemistry to describe the geometry of molecules.



