Final answer:
C9H20 (nonane) is expected to have the largest dispersion forces due to its greater molar mass and higher number of electrons, which make it more polarizable compared to SiH4, H2, and C4H10.
Step-by-step explanation:
The question asks which compound is expected to have the largest dispersion forces. Dispersion forces, also known as London dispersion forces, are a type of intermolecular force that occurs in nonpolar molecules. The strength of these forces generally increases with the molar mass of the molecule and its ability to become polarized. Among the given compounds, C9H20 (nonane) will have the largest dispersion forces because it has the greatest molar mass and, consequently, the most electrons that can contribute to temporary dipoles, leading to stronger intermolecular interactions compared to the other molecules listed (SiH4, H2, and C4H10).