Differentiate between quantitative and qualitative organic analysis. Identify three (3) properties for qualitative organic analysis. Explain in details, two (2) properties of an organic substance. State three (3) each of the physical and chemical properties of elements in the periodic table.

A homologous series is a series of organic compounds that have the same general formula, similar chemical properties due to the presence of the same functional group, and show a gradual change in physical properties as the molecular mass increases. Each successive member in the series differs by a $\text{CH}_2$ unit.

The general formula for the alkane homologous series is $\boxed{\text{C}_n\text{H}_{2n+2}}$, where $n$ is the number of carbon atoms.

The configuration of a stereogenic centre (also known as a chiral centre) refers to the specific three-dimensional arrangement of the four different groups attached to that carbon atom. This spatial arrangement determines the specific stereoisomer (enantiomer) of the molecule. The most common method for assigning configuration is the Cahn-Ingold-Prelog (CIP) priority rules, which assign either an R (rectus) or S (sinister) designation to the chiral centre based on the priority of the attached groups.