What are strongest intermolecular force in hydrogen iodide ?

I expect it's dipole-dipole.

The strongest intermolecular force in hydrogen iodide (HI) is dipole-dipole interaction.

HI is a polar molecule due to the difference in electronegativity between hydrogen (H) and iodine (I). The iodine atom is more electronegative, resulting in a partial negative charge, while the hydrogen atom is partially positive.

The positive end of one HI molecule is attracted to the negative end of another HI molecule, creating a dipole-dipole interaction. This force results in higher boiling and melting points compared to non-polar molecules.

The strongest intermolecular force in hydrogen iodide (HI) is dipole-dipole interaction. To understand why this is the case, let's break it down.

Hydrogen iodide (HI) is a polar molecule. It consists of a hydrogen atom bonded to an iodine atom. Since iodine is more electronegative than hydrogen, there is an uneven distribution of electron density in the molecule. This leads to a partial positive charge on the hydrogen atom and a partial negative charge on the iodine atom.

Dipole-dipole interactions occur between polar molecules. The partially positive end of one molecule is attracted to the partially negative end of another molecule. In the case of HI, the partially negative iodine end of one molecule is attracted to the partially positive hydrogen end of another molecule. This creates a relatively strong force of attraction between the molecules.

To determine the strongest intermolecular force in a molecule, you should consider factors such as the polarity of the molecule, the presence of hydrogen bonding, and the size and shape of the molecules involved. In the case of hydrogen iodide (HI), dipole-dipole interactions are the primary intermolecular force due to the polarity of the molecule.