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9 January, 06:37

Which of the following molecules is nonpolar?

1. BF3

2. H2O

3. NF3

4. CH3Br

5. SO2

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Answers (1)
  1. 9 January, 06:45
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    1. BF3 This is a trigonal planar molecule; the electron density is drawn into a cloud that circles the Boron, this is made nonpolar by the geometrically equivalent structure of the surrounding electronegative Fluorines.

    2. H2O The 2 lone pairs of e - of Oxygen makes the O partially negative, the H's, partially positive. Polar.

    3. NF3 Lone pair on Nitrogen overwhelmed by the 3 incredibly electronegative Fluorines. Polar

    4. CH3Br The "Soft Ion" of Bromine is negative; it is electronegative. Polar.

    5. SO2 the lone pairs of Oxygen, at approximately 119°-120° angles to one another will form a reasonance structure; there will be more lone pairs about the Oxygen than the Sulfur; the Sulfur will be partially positive compared to the oxygens. Polar.
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