Complete the following reactions by supplying the products and the reagents
`CH_(3) (CH_(2))_(4) CH_(3) overset(Cr_(2) O_(3), AI_(2)O_(3))underset(773 K, 10-20 atm)(to) [A] overset(Br_(2) // Fe)(to) [B] overset(Mg// "ether ")(to) [C ] overset(D_(2)O)(to) [D]`

Explanation

To complete the reactions given in the question, we will analyze each step and determine the products and reagents involved.

### Step-by-Step Solution:

1. **Identifying the Starting Material:**
- The starting material is **N-hexane** (CH₃(CH₂)₄CH₃). This is a straight-chain alkane with 6 carbon atoms.

2. **Step A: Reaction with Cr₂O₃ and Al₂O₃ at High Temperature and Pressure**
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