Answer
See the answer below.
Work Step by Step
a) Nonpolar, polar bonds with the same difference in electronegativity in a symmetrical geometry (linear).
b) Polar, polar bonds with unequal differences in electronegativity in a symmetrical geometry (trigonal planar).
Boron is less electronegative than both hydrogen and fluorine so it's the positive end in the molecule; hydrogen and fluorine are the negative ends.
c) Polar, polar bonds with unequal differences in electronegativity in a symmetrical geometry (tetrahedral).
Carbon is more electronegative than hydrogen, but less than chlorine so the hydrogens are the positive end and chlorine, the negative.
d) Nonpolar, polar bonds with the same difference in electronegativity in a symmetrical geometry (trigonal planar).
