Which of these molecules are polar? Check all that apply?
Concepts and reason
If the electronegativity of the two bonded atoms are different then the bond is polar. Although, some molecules contain polar bonds, the molecule may be non-polar. If the polarity of all the bonds present in the molecule are cancel each other then molecule is non-polar.
If one atom is highly electronegative than the other atom in the bond, then the highly electronegative atom attracts the bonding pair of electrons more than its share. Hence, partial negative charge is developed on the highly electronegative atom and partial positive charge is developed on the less electronegative atom.
The structures of the molecules and the direction of the dipolemoment of the bonds are as follows:
In, the chlorine is highly electronegative than phosphorous. Hence, the direction of polarity is towards chlorine atom. In, oxygen is highly electronegative. Hence, the direction of polarity is towards oxygen atom. In, chlorine is highly electronegative. Hence, the direction of polarity is towards chlorine atom.
Identify the resultant vector of all the dipole moments of various bonds.
The resultant vector of the all the dipolemoments of the molecules are as follows:
Hence, the polar molecules are
The red color arrows show the direction of resultant vector in each molecule. In, the polarity of the bonds cancels each other. Hence, the net dipole moment is zero. Therefore, is non-polar.
Thus the polar molecules are