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3 December, 22:21

Given the electronegativities below, which covalent single bond is most polar?

Element: H C N O

Electronegativity: 2.1 2.5 3.0 3.5

A) N-H B) O-C C) O-N D) C-H E) O-H

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  1. 3 December, 22:24
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    So the correct answer is e) O-H

    Explanation:

    To determine the most polar bond we calculate the electronegativity difference in each bond and determine the highest value:

    a) N-H = 3.0 - 2.1 = 0.9

    b) O-C = 3.5 - 2.5 = 1

    c) O-N = 3.5 - 3 = 0.5

    d) C-H = 2.5 - 2.1 = 0.4

    e) O-H = 3.5 - 2.1 = 1.4

    So the correct answer is e) O-H
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