Different substances exhibit different types of bonding depending on their constituent elements and structures. Which of the following statements correctly describes the bonding present in the specified substance?
In gaseous hydrogen chloride, the bonding is purely ionic due to the large electronegativity difference between hydrogen and chlorine.
In solid ammonium chloride, there is a combination of ionic, covalent, and coordinate (dative covalent) bonding.
In brass, a mixture of copper and zinc, the atoms are held together by directional covalent bonds formed by sharing d-orbital electrons.
In quartz (silicon dioxide), discrete SiO2\text{SiO}_2SiO2 molecules are held together by strong intermolecular hydrogen bonds.