H4C2 is organic compound named 'Ethylene'! It contains two carbon atoms which have two hydrogen atoms bonded to each carbon! It is gas at room temperature!
No its not polar
It is a polar molecule and has polar bonds.
Polar contains polar. Non-polar contains nothing.
Polar
Polar
Nonpolar
ClO4 is polar.
polar
It is Polar
PBr3 is non-polar: the dipole moment of PBr3 is zero and therefor it is non-polar.
polar