Benzoin Condensation.

Explanation

### Step-by-Step Text Solution for Benzoin Condensation

**Step 1: Reactants Identification**
- The reaction involves two molecules of benzaldehyde (C₆H₅CHO) and a cyanide ion (CN⁻) as a catalyst.

**Step 2: Formation of the Nucleophile**
- The cyanide ion acts as a nucleophile and attacks the carbonyl carbon of the benzaldehyde. This leads to the formation of an intermediate where the carbonyl oxygen becomes negatively charged (alkoxide ion).

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