Which is polar? BеBr 2 CO 2 CF4 CH 20H PF 5 0 0 0 0 O

Polarity of a Molecule depends on the structure type and arrangement of its different atoms arround the central atom. 

(1) BeBr₂ - 

Beryllium dibromide is a linear Molecule, with bond angle of 180° , thus dipole moment is in opposite directions , thus it is a non polar Molecule. 

(2) CO₂ - 

Carbon dioxide is also a linear Molecule , with bond angle of 180° , thus it is also a non polar covalent Molecule. 

(3) CF₄ - 

Carbon tetrafluoride is tetrahedral Molecule with bond angle of 109.5° , but due opposite directions of dipole ,it is a non polar Molecule. 

(4) CH₂OH - 

Methanol has central atom of Carbon but due to presence of lone pair on oxygen atom , it is polar in nature. 

(5) PF₅ - 

Phosphorus pentafluoride has Trigonal bipyramidal structure, with opposite directions of dipole moment, thus it is also a non polar covalent Molecule.