Which of the following compounds contains both ionic and covalent bonds?

Options

A. `CH_2Cl_2`
B. `CHCl_3`
C. `NaClO_4`
D. `PCl_3`

Answer

To determine which of the given compounds contains both ionic and covalent bonds, we need to analyze each compound based on the definitions of ionic and covalent bonds.

### Step-by-Step Solution:

1. **Understand Ionic Bonds**:
- Ionic bonds are formed between metals and non-metals. In ionic compounds, electrons are transferred from the metal to the non-metal, resulting in the formation of cations (positively charged ions) and anions (negatively charged ions).

2. **Understand Covalent Bonds**:
- Covalent bonds are formed when two non-metals share electrons to achieve a full outer shell (octet). This typically occurs between atoms with similar electronegativities.

3. **Analyze Each Compound**:
- **CH2Cl2 (Dichloromethane)**:
- Carbon (C) is a non-metal and shares electrons with hydrogen (H) and chlorine (Cl). This compound is purely covalent as it involves sharing of electrons without any ionic character.
- **CHCl3 (Chloroform)**:
- Similar to CH2Cl2, this compound involves sharing of electrons between carbon and chlorine. It is also purely covalent.
- **NaClO4 (Sodium Perchlorate)**:
- Sodium (Na) is a metal and forms a cation (Na⁺). The perchlorate ion (ClO4⁻) involves covalent bonds between chlorine and oxygen atoms, where electrons are shared. Therefore, NaClO4 contains both ionic (Na⁺ and ClO4⁻) and covalent bonds (within ClO4⁻).
- **PCl3 (Phosphorus Trichloride)**:
- Phosphorus (P) and chlorine (Cl) are both non-metals, and they share electrons to form covalent bonds. This compound does not contain ionic bonds.

4. **Conclusion**:
- Among the given compounds, only **NaClO4 (Sodium Perchlorate)** contains both ionic and covalent bonds.

### Final Answer:
The compound that contains both ionic and covalent bonds is **NaClO4 (Sodium Perchlorate)**.

---