Arrange the following types of intermolecular forces in order of decreasing their strength
(a) Ion dipole
(b) Keesom forces
(C ) Dispersion or London forces
(d) Dipole-induced dipole
(e) lon-induced dipole (Debye forces) .

Explanation

To arrange the given types of intermolecular forces in order of decreasing strength, we will analyze each type of force based on their characteristics and relative strengths.

### Step 1: Understand the Types of Intermolecular Forces
1. **Ion-Dipole Forces**: These forces occur between an ion and a polar molecule. They are typically the strongest type of intermolecular force due to the strong attraction between the charged ion and the dipole of the polar molecule.

2. **Keesom Forces (Dipole-Dipole Forces)**: These forces arise between polar molecules due to the attraction of the positive end of one dipole to the negative end of another. They are weaker than ion-dipole forces but stronger than dispersion forces.

3. **Dipole-Induced Dipole Forces**: These forces occur when a polar molecule induces a dipole in a nonpolar molecule by distorting its electron cloud. They are weaker than Keesom forces.
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