The compound formed during electrolysis of brine is:

Options

A. `Cl_2`
B. `H_2`
C. NaOH
D. NaH

Explanation

To determine the compound formed during the electrolysis of brine, we can follow these steps:

### Step 1: Understand what brine is
Brine is a concentrated solution of sodium chloride (NaCl) in water. It is the starting material for the electrolysis process.

**Hint:** Remember that brine is essentially saltwater, which contains sodium ions (Na⁺) and chloride ions (Cl⁻) in solution.

### Step 2: Know the process of electrolysis
Electrolysis involves passing an electric current through the brine solution. This process causes the ions in the solution to move towards the electrodes, where they undergo chemical reactions.

**Hint:** Electrolysis separates the components of the brine solution into different products based on their movement towards the electrodes.

### Step 3: Identify the products formed
During the electrolysis of brine, three main products are formed:
1. Chlorine gas (Cl₂) at the anode (positive electrode).
2. Hydrogen gas (H₂) at the cathode (negative electrode).
3. Sodium hydroxide (NaOH) remains in the solution.

**Hint:** Focus on the key products formed at each electrode during the electrolysis process.

### Step 4: Determine the compound
Among the products, sodium hydroxide (NaOH) is a compound formed during the electrolysis of brine. Chlorine gas (Cl₂) and hydrogen gas (H₂) are not compounds as they consist of the same type of atoms bonded together.

**Hint:** A compound is defined as a substance formed when two or more different types of atoms bond together.

### Conclusion
The compound formed during the electrolysis of brine is sodium hydroxide (NaOH).

**Final Answer:** Sodium hydroxide (NaOH) is the compound formed during the electrolysis of brine.