37) In liquid propanol, CH3CH2CH2OH, which intermolecular forces are present? A) Only dipole-dipole and ion-dipole forces are present. B) Only dispersion and dipole-dipole forces are present. C) Only hydrogen bonding forces are present D) Dispersion, hydrogen bonding and dipole-dipole forces are present. 38) _ 38) The first-order decomposition of N2O5 at 328 K has a rate constant of 1.70 . 10-3 -1. If the initial concentration of N2O5 is 2.88 M, what is the concentration of N2O5 after 12.5 minutes? A) 0.174 M B ) 0.805 M C) 0.355 M D) 0.124 M E ) 2.82 M

In liquid propanol, CH3CH2CH2OH, which intermolecular forces are present, option (d) is correct i.e. Dispersion, hydrogen bonding and dipole-dipole forces are present.

The electromagnetic forces of attraction or repulsion that act between atoms and other types of nearby particles, such as atoms or ions, are examples of intermolecular forces (IMFs), also known as secondary forces. In comparison to intramolecular forces, which hold a molecule together, intermolecular forces are weak. For instance, the forces between adjacent molecules are substantially weaker than the covalent bond, which involves sharing electron pairs between atoms. Both types of forces are crucial components of the force fields that molecular mechanics typically use. A hydrogen bond, which refers to the attraction between a hydrogen atom that is bound to an element with high electronegativity, typically nitrogen, oxygen, or fluorine, is an extreme instance of dipole-dipole bonding. A common way to explain the hydrogen bond is as a powerful electric dipole-dipole interaction. The fact that it is directional, stronger than a van der Waals force interaction, produces interatomic distances shorter than the sum of their van der Waals radii, and typically only involves a small number of interaction partners can be interpreted as a form of valence.

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