Which of the following behaves like pseudohalogen compound:

Options

A. (A) NC CN
B. (B) `CN^-`
C. (C) `N_3^-`
D. (D) `l_3^-`

Answer

To determine which of the given compounds behaves like a pseudohalogen, we need to understand what pseudohalogens are and how they relate to halogens.

### Step-by-Step Solution:

1. **Definition of Pseudohalogen**:
- Pseudohalogens are polyatomic species that mimic the behavior of halogens (fluorine, chlorine, bromine, iodine, and astatine). They often have similar chemical properties and can participate in similar reactions as halogens.

2. **Characteristics of Pseudohalogens**:
- Pseudohalogens typically carry a uninegative charge (−1) and can form compounds that resemble those formed by halogens.

3. **Identifying Pseudohalogens**:
- Common examples of pseudohalogens include cyanide (CN⁻) and azide (N₃⁻). Both of these species carry a uninegative charge and exhibit chemical behavior similar to halogens.

4. **Analyzing the Options**:
- Given the options, we need to identify which compounds are pseudohalogens.
- If the options include CN⁻ and N₃⁻, these are indeed pseudohalogens due to their charge and behavior.

5. **Conclusion**:
- Therefore, the correct options that behave like pseudohalogen compounds are option 2 (CN⁻) and option 3 (N₃⁻).

### Final Answer:
- The compounds that behave like pseudohalogen compounds are option 2 (CN⁻) and option 3 (N₃⁻).