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 step by step, let's analyze each part of the question systematically.

### Step 1: Reaction with Cr₂O₃ and Al₂O₃
- **Starting Material**: CH₃(CH₂)₄CH₃ (n-hexane)
- **Reagents**: Cr₂O₃, Al₂O₃, 773 K, 10-20 atm
- **Reaction Type**: Dehydrogenation and cyclization
- **Product [A]**: Benzene (C₆H₆)

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