Assertion : Saturated hydrocarbons are chemically less reactive.Reason : All isomeric paraffins have the same parent name.

The assertion and the reason are not directly related.

Assertion: Saturated hydrocarbons are chemically less reactive. This is true because saturated hydrocarbons, also known as alkanes, have single bonds between carbon atoms and are filled to capacity with hydrogen atoms. This makes them relatively stable and less reactive compared to unsaturated hydrocarbons, which contain double or triple bonds and can react more readily with other substances.

Reason: All isomeric paraffins have the same parent name. This is a statement about the nomenclature of isomers, not their reactivity. Isomers are compounds with the same molecular formula but different structural formulas. Paraffins are a type of alkane, and isomeric paraffins would indeed have the same parent name because they contain the same number of carbon and hydrogen atoms. However, this fact does not directly relate to the reactivity of saturated hydrocarbons.

So, while both the assertion and the reason are true statements, the reason does not correctly explain the assertion.