Question

arrange the highlighted bonds in the table below in decreasing order of polarity. that is, pick 1 for the most polar bond, 2 for the next most polar bond, and so on. bond polarity select select select

Explanation:

Step1: Recall electronegativity values

Electronegativity of H = 2.2, N = 3.04, F = 4.0, C = 2.55.

Step2: Calculate electronegativity differences

For N - H bond: $\Delta\chi=3.04 - 2.2=0.84$.
For H - F bond: $\Delta\chi=4.0 - 2.2 = 1.8$.
For C - H bond: $\Delta\chi=2.55 - 2.2=0.35$.

Step3: Arrange by electronegativity difference

Higher $\Delta\chi$ means more polar bond. So H - F (most polar), N - H, C - H (least polar).

Answer:

H - F: 1
N - H: 2
C - H: 3