Answer:
see explanation
Explanation:
The polarity of bonds is determined by electronegativity differences. As a guideline we define bonds as:
ionic if Δχ > 2.0
polar if 2.0 > Δχ > 0.5
nonpolar if 0.5 > Δχ
(X being electronegativity)
The polarity of bonds helps us understand non-covalent forces between molecules, such as hydrogen bonding and dipole-dipole interactions. It also helps us interpret the reactivity of molecules. For example, the Si-H bond (χSi = 1.8, χH = 2.1) is more hydride-like than the C-H bond (χC = 2.5, χH = 2.1). Therefore silanes react with acids to make H2, whereas phosphines (χP = 2.1) and hydrocarbons do not. Similarly, electrophilic substitution reactions occur more readily on Si-H and P-H compounds than they do on C-H compounds.
