Identify A, B, C , -------- in the following.
`EtOH overset(PCl_(5))to A underset(Et_(2)O)overset(Mg)toBunderset(2. H_(3)O^(+))overset(1."cyclohexanone")toC`

Explanation

To solve the problem, we need to identify the compounds A, B, and C in the given sequence of reactions starting from ethanol (EtOH). Let's break down the steps:

### Step 1: Identify Compound A
Ethanol (EtOH) reacts with phosphorus pentachloride (PCl5). The reaction of an alcohol with PCl5 typically results in the formation of an alkyl chloride.

**Reaction:**
\[ \text{EtOH} + \text{PCl}_5 \rightarrow \text{EtCl} + \text{POCl}_3 + \text{HCl} \]

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