Which of the following are not ionic compounds?

Options

A. I and ii
B. ii and iii
C. iii and iv
D. I and iii

Explanation

To determine which of the given compounds are not ionic compounds, we will analyze each compound based on the nature of the bonds they form.

### Step-by-Step Solution:

1. **Understanding Ionic Compounds**:
- Ionic compounds are formed by the transfer of electrons from one atom to another, resulting in the formation of charged ions (cations and anions). The electrostatic attraction between these oppositely charged ions forms an ionic bond.

2. **Analyzing the Given Compounds**:
- The compounds given are: KCl, HCl, CCl4, and NaCl.

3. **Identifying Ionic Compounds**:
- **KCl (Potassium Chloride)**:
- Potassium (K) loses one electron to become K⁺, and Chlorine (Cl) gains that electron to become Cl⁻.
- This transfer of electrons indicates that KCl is an ionic compound.

- **NaCl (Sodium Chloride)**:
- Sodium (Na) loses one electron to become Na⁺, and Chlorine (Cl) gains that electron to become Cl⁻.
- This also indicates that NaCl is an ionic compound.

4. **Identifying Covalent Compounds**:
- **HCl (Hydrochloric Acid)**:
- In HCl, Hydrogen (H) and Chlorine (Cl) share electrons rather than transferring them.
- This sharing of electrons forms a polar covalent bond, making HCl a covalent compound.

- **CCl4 (Carbon Tetrachloride)**:
- In CCl4, Carbon (C) shares electrons with four Chlorine (Cl) atoms.
- The electronegativity difference is not sufficient to create a polar bond, resulting in a non-polar covalent bond. Thus, CCl4 is also a covalent compound.

5. **Conclusion**:
- The compounds that are not ionic compounds from the given options are HCl and CCl4.

### Final Answer:
The compounds that are not ionic compounds are **HCl and CCl4**.