Final answer:
Ethers with larger alkyl groups have higher boiling points due to increased molecular size and surface area, which leads to stronger London dispersion forces.
Step-by-step explanation:
Ethers with larger alkyl groups have higher boiling points due to increased molecular size and surface area, which leads to stronger London dispersion forces. London dispersion forces are temporary attractive forces between molecules due to the constant movement of electrons. Larger alkyl groups have more electrons, resulting in stronger dispersion forces and higher boiling points.