Problem: What types of intermolecular forces exist between hydrogen iodide molecules?I. London forcesII. dipole-dipole interactionsIII. hydrogen bondingIV. ion-dipole interactionsA. I and II only      B. I only      C. III only      D. II and III only      E. I, II, and III only

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We’re being asked to identify the intermolecular forces present in HI. Recall that there are several types of intermolecular forces:

1. Ion-dipole interaction – occurs between an ion and a polar covalent compound

2. Hydrogen bonding – occurs in compounds where hydrogen is directly connected to an electronegative element such as N, O, or F

3. Dipole-dipole interaction – occurs between two polar covalent compounds

4. Induced-dipole interaction – occurs when a nonpolar compound interacts with a polar compound

5. Dispersion forces – occurs in all compounds. This is the primary intermolecular force exhibited by nonpolar compounds.


For this problem, we need to do the following steps:

Step 1: Calculate the total number of valence electrons present.

Step 2: Draw the Lewis structure for the molecule.

Step 3: Determine the polarity and IMF of the molecule.


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Problem Details

What types of intermolecular forces exist between hydrogen iodide molecules?

I. London forces
II. dipole-dipole interactions
III. hydrogen bonding
IV. ion-dipole interactions

A. I and II only      B. I only      C. III only      D. II and III only      E. I, II, and III only

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