A student measures a volume of methanol using a graduated cylinder that they have just washed but did not dry or rinse with methanol. What type of error could be introduced

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Ibelieve it is b. proton.hope my answer has you : )