The following is used for metal cleaning and finishing

Options

A. `CHCl_3`
B. `CHI_3`
C. `CH_2Cl_2`
D. `C_6H_6`

Answer

To determine which compound is used for metal cleaning and finishing among the given options, let's analyze each compound step by step.

### Step 1: Identify the Compounds
We have four compounds to consider:
1. CHCl3 - Chloroform
2. CHI3 - Iodoform
3. CH2Cl2 - Dichloromethane
4. C6H6 - Benzene

### Step 2: Analyze Each Compound
- **Option A: CHCl3 (Chloroform)**
- Chloroform is primarily used as a solvent and has applications in anesthesia. It is not typically used for metal cleaning and finishing.

- **Option B: CHI3 (Iodoform)**
- Iodoform is known for its antiseptic properties and is used in medical applications. It does not serve the purpose of metal cleaning and finishing.

- **Option C: CH2Cl2 (Dichloromethane)**
- Dichloromethane is a solvent that is commonly used in various applications, including metal cleaning and finishing. This makes it a suitable candidate for our requirement.

- **Option D: C6H6 (Benzene)**
- Benzene is widely used in the chemical industry for applications such as printing, paint, and dry cleaning. However, it is not specifically used for metal cleaning and finishing.

### Step 3: Conclusion
Based on the analysis, the compound that is used for metal cleaning and finishing is **CH2Cl2 (Dichloromethane)**.

### Final Answer
**CH2Cl2 (Dichloromethane)** is the compound used for metal cleaning and finishing.

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