Final answer:
Neon (Ne) would deviate the least from ideal gas behavior due to being monatomic and having negligible intermolecular forces compared to the other gases listed.
Step-by-step explanation:
The gas that would deviate the least from ideal gas behavior among the options given is Neon (Ne). Ideal gas behavior is most closely approached by monatomic gases with negligible intermolecular forces and small, nonpolar molecules. Neon is a noble gas, which is monatomic and nonpolar. Therefore, it has negligible intermolecular forces, causing it to behave more like an ideal gas compared to the other options. By contrast, CH₃Cl (methyl chloride) and CO₂ (carbon dioxide) are polar molecules with stronger intermolecular forces, and Krypton (Kr), although a noble gas, is larger and thus has more pronounced van der Waals forces than Neon. F₂ (fluorine gas) is diatomic but reactable and thus has stronger intermolecular forces compared to Neon.