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0IggyMarie0
24.03.2020 •
Chemistry
Which choice(s) correctly rank(s) the bonds in terms of increasing polarity?
I. Cl?F < Br?Cl < Cl?Cl II. H?C < H?N < H?O
III. Br?F < I?F < Cl?F IV. Si?Cl < Si?P < Si?C < Si?F
I, II only
II only
II, IV only
I, III, IV only
I only
Solved
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Ответ:
(II) only correctly rank the bonds in terms of increasing polarity.
Explanation:
Bond polarity is proportional to difference in electronegativity between bonded atoms.
Atoms Electronegativity Bond Electronegativity difference
Cl 3.0 Cl-F 1.0
Br 2.8 Br-Cl 0.2
F 4.0 Cl-Cl 0
H 2.1 H-C 0.4
C 2.5 H-N 0.9
N 3.0 H-O 1.4
O 3.5 Br-F 1.2
I 2.7 I-F 1.3
Si 1.9 Cl-F 1.0
P 2.2 Si-Cl 1.1
Si-P 0.3
Si-C 0.6
Si-F 2.1
So, clearly, order of increasing polarity : O-H > N-H > C-H
So, (II) only correctly rank the bonds in terms of increasing polarity
Ответ:
The correct answer is - Statement I is true, Statement-II is false.
Explanation: