Question

What is stereoisonerism?

Answer 1

stereoisonerism is the arrangement of atoms in molecules whose connectivity remains the same

Answer 2

Stereo isomerism are those molecules which have same molecular formula but differ in the three dimensional orientation in space.
In stereochemistry, stereoisomers are isomeric molecules that have the same molecular formula and sequence of bonded atoms (constitution), but differ in the three-dimensional orientations of their atoms in space.[1][2] This contrasts with structural isomers, which share the same molecular formula, but the bond connections or their order differs. By definition, molecules that are stereoisomers of each other represent the same structural isomer.
example.It has the same C18H34O2 formula and arrangement of atoms. The only difference is that the double bond between carbons 9 and 10 is in the trans configuration. A more advanced exampledemonstrating geometric isomers caused by a ring structure is cis-1,4-dimethylcyclohexane and trans-1,4-dimethylcyclohexaneare.