The bond not present in `KHF_2` is 

Options

A. hydrogen
B. Dative
C. Ionic
D. Covalent

Answer

To determine the bond that is not present in KHF2, we need to analyze the structure and bonding of the compound.

### Step-by-Step Solution:

1. **Identify the Components of KHF2**:
KHF2 is composed of potassium (K), hydrogen (H), and fluorine (F). It can be seen as a combination of potassium fluoride (KF) and hydrofluoric acid (HF).

2. **Understand the Bonding in KF**:
- Potassium fluoride (KF) consists of K+ ions and F- ions.
- The bond between K+ and F- is an **ionic bond** due to the transfer of electrons from potassium to fluorine.

3. **Analyze the Bonding in HF**:
- Hydrofluoric acid (HF) contains a covalent bond between H and F.
- In HF, the hydrogen atom shares an electron with the fluorine atom, resulting in a **covalent bond**.

4. **Consider the Interactions in KHF2**:
- When KF reacts with HF, it forms KHF2.
- In KHF2, K+ ions interact with HF molecules.
- The HF molecule can also form hydrogen bonds with the fluoride ions (F-) present.

5. **Identify the Types of Bonds Present**:
- In KHF2, we have:
- **Ionic bond**: between K+ and F- from KF.
- **Covalent bond**: within the HF molecule (H-F bond).
- **Hydrogen bond**: between HF and F- ions.

6. **Determine the Bond Not Present**:
- The bonds that are present in KHF2 are ionic, covalent, and hydrogen bonds.
- The bond that is **not present** in KHF2 is a **dative bond** (also known as a coordinate bond), where both electrons in the bond come from the same atom.

### Final Answer:
The bond not present in KHF2 is a **dative bond**.

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