SAMPLE PROBLEM 9.3
Determining Bond Polarity from EN Values
PROBLEM:
PLAN:
SOLUTION:
(a) Use a polar arrow to indicate the polarity of each bond: N-H, F-N, I-Cl.
(b) Rank the following bonds in order of increasing polarity: H-N, H-O, H-C.
(a) Use Figure 9.16 to find EN values; the arrow should point toward the negative end.
(b) EN increases across a period.
(a) The EN of N = 3.0, H = 2.1, F = 4.0, I = 2.5, Cl = 3.0
N - H
F - N
I - Cl
(b) The order of increasing EN is C < N < O; all have an EN larger than that of H.
H-C < H-N < H-O
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