When hydrogens on an unsaturated fatty acid lie on the same side of the carbon-carbon double bond, a formation exists?

When hydrogen a CIS formation exist.
There are two types of formation which are possible in fatty acids, these are CIS and TRANS configurations.
A fat is described as a CIS fatty acid if its hydrogen atoms are lying on the same side of the carbon carbon double bonds. A fat is said to be a trans fatty acid, if the hydrogen atoms in its molecules are lying on the opposite sides of the carbon bonds.

Cr(oh)3 -> cr(3+) + 3oh-