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Which of the following would have a permanent dipole moment?

1. SiF4
2. SF4
3. XeF4
4. BF3

Correct answer: SF4

Solution

SF4 has a seesaw molecular geometry due to the presence of one lone pair on sulfur, resulting in an asymmetric charge distribution and a permanent dipole moment. The other molecules are symmetric and have no net dipole moment.

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