Correct Answer - D
Intermolecular forces holding nonpolar or very weakly polar molecules of alkanes together ( dispersion or London forces) are very weak and are of very short range. They act only between the portions of different molecules. Within a homologus series(family), the larger the molecule and hence the larger its surface area the stronger the intermolecular forces. `n`-Alkanes `C_(18)` onwards are colorless solids at room temperature.
