2. For each of the following bonds, indicate whether the bond is ionic,
nonpolar covalent, or polar covalent:
a.
B-P
b.
H - CI
C. Ca - Br
d. Pb-s

16- counting by fours

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Ibelieve the answer is d. bleachhope my answer has you : )