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Beryllium fluoride (BeF2) has a linear geometry, resulting in no dipole moment, whereas water (H2O), with its angular structure, exhibits a measurable dipole moment.

1. Molecule with a straight shape
2. Molecule with an angular shape
3. No dipole moment present
4. Presence of a measurable dipole moment

Correct answer: No dipole moment present

Solution

BeF2 is linear, and the bond dipoles cancel out, resulting in a zero dipole moment. H2O is bent, so its bond dipoles do not cancel, leading to a non-zero dipole moment.

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