Which of the following is not hydrolysed

Options

A. `AsCl_3`
B. `PF_3`
C. `SbCl_3`
D. `NF_3`

Explanation

To determine which of the given compounds is not hydrolyzed, we need to understand the concept of hydrolysis and the factors that influence it. Hydrolysis refers to the reaction of a substance with water, resulting in the breakdown of that substance.

### Step-by-Step Solution:

1. **Understanding Hydrolysis**:
- Hydrolysis involves the reaction of a compound with water, leading to the formation of new products. This process is common in many metal salts and some non-metal compounds.

2. **Identifying Compounds**:
- We need to consider the compounds in question (though not specified here, they could be metal salts or non-metal oxides). Common examples include metal chlorides, sulfates, and oxides.

3. **Analyzing Electron Configuration**:
- The ability of a compound to undergo hydrolysis often depends on its electron configuration. Compounds with empty d-orbitals can accept lone pairs from water molecules, facilitating hydrolysis.

4. **Determining the Role of D-Orbitals**:
- The absence of d-orbitals in certain compounds means they cannot accept lone pairs from water. This characteristic can prevent hydrolysis. For example, compounds like AlCl3 can hydrolyze, while others like NaCl do not hydrolyze due to the absence of d-orbitals.

5. **Conclusion**:
- Based on the above analysis, the compound that lacks d-orbitals and cannot accept lone pairs from water is the one that is not hydrolyzed.

### Final Answer:
The compound that is not hydrolyzed is the one that lacks d-orbitals and cannot accept lone pairs from water.