Which of the following compounds are analogous to the lanthanides?

Options

A. Actinides
B. Borides
C. Carbides
D. Hydrides

Explanation

To determine which of the given compounds are analogous to the lanthanides, we need to analyze the options provided and understand the relationship between lanthanides and other groups of elements.

### Step-by-Step Solution:

1. **Identify Lanthanides**:
- The lanthanides are a series of 15 elements in the periodic table, starting from cerium (Ce, atomic number 58) to lutetium (Lu, atomic number 71). They are located in the f-block of the periodic table.

2. **Understand Analogous Compounds**:
- Analogous compounds are those that share similar properties or characteristics. In the context of the periodic table, this often refers to elements in the same group or block.

3. **Analyze the Options**:
- **Option A: Actinide**: The actinides are another series of elements in the f-block, starting from actinium (Ac, atomic number 89) to lawrencium (Lr, atomic number 103). They share similar properties with lanthanides due to their position in the periodic table.
- **Option B: Boride**: Borides are compounds containing boron and do not share a similar block or properties with lanthanides.
- **Option C: Carbide**: Carbides are compounds of carbon with a more metallic element, and they do not have a direct analogy with lanthanides.
- **Option D: Hydride**: Hydrides are compounds formed with hydrogen and do not exhibit the same properties as lanthanides.

4. **Conclusion**:
- Since actinides are also f-block elements and share similar chemical properties with lanthanides, we conclude that **Option A: Actinide** is the correct answer.

### Final Answer:
The compound that is analogous to the lanthanides is **Option A: Actinide**.