The correct answer is option c): the oxygen atom in one molecule and the hydrogen atom in another water molecule.
Intermolecular forces or bonds are those interactions that hold molecules together. These are electrostatic forces.
Van der Waals forces are weak attractions that hold electrically neutral molecules together. At some point these molecules present an induced dipole, that is, the molecule acquires a partially positive and a partially negative charge momentarily, causing them to attract each other.
There are Van de Waals forces: Dipole - Dipole Forces, London Forces, Ion - Dipole Forces.
The dipole-dipole forces are forces of attraction between polar molecules. These molecules attract when the positive end of one of them is close to the negative of the other.
Hydrogen bonds are a type of dipole-dipole force. In this interaction, a molecule that presents hydrogen interacts with another that presents an atom with high electronegativity, such as oxygen, fluorine or nitrogen (O, F, N).
In this way, between the hydrogen, which has a low electronegativity and the electronegative atom, an interaction is established, due to their opposite charges.
Each water molecule has three atoms, two hydrogen and one oxygen.
In this case, between the different water molecules, the hydrogen bond is formed as follows: Oxygen is very electronegative, that is, it attracts the electrons of the bond with much more force than hydrogen.
As a consequence of this, oxygen is negatively charged and hydrogen positively, and a dipole moment is created. In this way, the water molecules clump together with each other.
In summary, the hydrogen in one water molecule is attracted to the oxygen atom in another water molecule.
So, the correct answer is option c): the oxygen atom in one molecule and the hydrogen atom in another water molecule.
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