Question

Which will diffuse faster in protein free lipid membrane?

Answer 1

Answer:

Protein-free Lipid Bilayers Are Highly Impermeable to Ions

Small nonpolar molecules, such as O2 and CO2, readily dissolve in lipid bilayers and therefore diffuse rapidly across them. Small uncharged polar molecules, such as water or urea, also diffuse across a bilayer, albeit much more slowly