To determine which of the given compounds are not ionic, we need to understand the nature of ionic and covalent compounds.

Ionic compounds are formed between a metal and a non-metal. They are composed of ions held together by electrostatic forces. In an ionic compound, the metal loses electrons to form a positively charged cation, while the non-metal gains electrons to form a negatively charged anion.

Covalent compounds, on the other hand, are formed between two non-metals. In covalent compounds, electrons are shared between atoms to form covalent bonds.

Now, let's analyze each of the given compounds:

(i) KCl:
KCl is an ionic compound. It is composed of a metal (potassium) and a non-metal (chlorine). Potassium loses one electron to form a cation (K+), and chlorine gains one electron to form an anion (Cl-). The electrostatic attraction between the oppositely charged ions holds the compound together.

(ii) HCl:
HCl is a covalent compound. It is composed of two non-metals (hydrogen and chlorine). In HCl, hydrogen shares one electron with chlorine to form a covalent bond. The electrons are attracted to both atoms, creating a shared electron pair.

(iii) CCl4:
CCl4 is a covalent compound. It is composed of carbon and chlorine, both non-metals. In CCl4, carbon shares its four valence electrons with four chlorine atoms, forming four covalent bonds. The electrons are shared between the carbon and chlorine atoms.

(iv) NaCl:
NaCl is an ionic compound. It is composed of a metal (sodium) and a non-metal (chlorine). Sodium loses one electron to form a cation (Na+), and chlorine gains one electron to form an anion (Cl-). The electrostatic attraction between the oppositely charged ions holds the compound together.

From the analysis above, we can see that the compounds HCl and CCl4 are covalent compounds, not ionic. Therefore, the correct answer is option (ii) and (iii).