Chemistry

Question Analysis
This question involves the core principle of judging bond polarity by electronegativity difference between bonded atoms. 

Key Concept Explanation
Electronegativity is the tendency of an atom to attract a bonding pair of electrons. The greater the difference in electronegativity between two atoms, the more polar the bond.

Step-by-step Solution
Calculate the electronegativity difference for each bond:
H-H: ΔEN = ∣2.2 - 2.2∣= 0 → nonpolar covalent bond.
H-N: ΔEN = ∣2.2 - 3.04∣= 0.84 → polar covalent bond.
H-C: ΔEN = ∣2.2 - 2.55∣= 0.35 → polar covalent bond.
H-F: ΔEN = ∣2...