The compound which contains both covalent and coordinate bond is

Options

A. `C_2H_5NC`
B. `C_2H_5CN`
C. `HCN`
D. `KMnO_4`

Answer

To solve the question of which compound contains both covalent and coordinate bonds, we will analyze the options provided and determine the type of bonds present in each compound.

### Step-by-Step Solution:

1. **Understanding Covalent and Coordinate Bonds**:
- **Covalent Bonds**: Formed when two atoms share electrons to achieve a full outer shell (octet).
- **Coordinate Bonds**: A type of covalent bond where one atom donates both electrons to the bond, typically involving a lone pair from one atom.

2. **Analyzing the Options**:
- We need to evaluate each compound given in the options to identify the presence of both covalent and coordinate bonds.

3. **Option Analysis**:
- **Option 1: K[MnO4] (Potassium permanganate)**:
- This compound primarily contains ionic and covalent bonds. It does not contain a coordinate bond. **(Cut this option)**

- **Option 2: HCN (Hydrogen cyanide)**:
- HCN consists of a triple bond between carbon and nitrogen, and a single bond between hydrogen and carbon. All bonds are covalent. **(Cut this option)**

- **Option 3: C2H5CN (Ethyl cyanide)**:
- This compound has a structure that includes covalent bonds. The carbon atoms are bonded to each other and to nitrogen through sharing of electrons. There are no coordinate bonds present. **(Cut this option)**

- **Option 4: C2H5NH2 (Ethylamine)**:
- In this compound, we have carbon atoms bonded to nitrogen. The nitrogen has a lone pair that can participate in forming a coordinate bond. When nitrogen donates its lone pair to form a bond with another atom (like in an amine reaction), it creates a coordinate bond. This compound contains both covalent bonds (C-H and C-N) and a coordinate bond (when nitrogen donates its lone pair). **(This is the correct option)**

4. **Conclusion**:
- The compound that contains both covalent and coordinate bonds is **C2H5NH2 (Ethylamine)**.

### Final Answer:
The compound which contains both covalent and coordinate bonds is **C2H5NH2 (Ethylamine)**.