Question

For hydrocarbons, if the molecular formula increases, then melting point

• A. increases
• B. decreases
• C. either increases or decreases
• D. No relation

Answer 1

The Correct Option is A

Correct answer: increases 

Explanation:
In hydrocarbons, as the molecular formula increases (i.e., as the number of carbon atoms increases), the size and mass of the molecule also increase. This leads to stronger van der Waals forces (intermolecular forces) between the molecules.

Stronger intermolecular forces require more energy (in the form of heat) to overcome, which results in a higher melting point.

Thus, for hydrocarbons, when the molecular formula increases, the melting point increases.