Which of the following substances have permanent dipole-dipole forces? (a) molecular AlBr3 ; (b)

step 1 This question is asking which of these molecules have dipole to dipole forces. When we are looki

Which of the following substances have permanent...

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Key Concepts

Electronegativity Differences

Differences in electronegativity between bonded atoms lead to bond dipoles, which are the foundation of molecular polarity. When atoms with different electronegativities form a bond, the electron density is drawn more to the more electronegative atom, creating a partial positive and negative charge on the respective atoms.

Molecular Symmetry

Symmetry is a key concept in determining molecular polarity. Highly symmetrical molecules often have equal and opposite dipole contributions that cancel each other out, resulting in a nonpolar molecule despite the presence of polar bonds.

Permanent Dipole?Dipole Interactions

These are intermolecular forces that occur when polar molecules, which have permanent dipoles due to uneven electron distribution, interact with each other. The positive end of one molecule is attracted to the negative end of another, leading to an attractive force that influences properties like boiling point and solubility.

Molecular Geometry and Polarity

The shape of a molecule plays a critical role in its overall polarity. Even if a molecule has polar bonds, the three-dimensional arrangement of these bonds determines whether the individual dipoles cancel out or add up to produce a net dipole moment.

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