Which of the following have the molecular formula C4H10O?

Can someone me with these questions plz.

Which is true of a liquid? it has a definite volume but not a definite mass.it has a definite mass but not a definite volume.it has a definite volume but not a definite shape.it has a definite shape but not a definite volume.

Which substance is a steroid? cholesterol fatty acid monosaccharide trans fat