Hydrazine reduce Fehling's solution to form:
(a). `Cu(OH)`
(b) `Cu_2O`
(c). `CuO`
(d). `Cu+O_2`

Explanation

To solve the question regarding what hydrazine reduces Fehling's solution to form, we can follow these steps:

### Step 1: Understand Fehling's Solution
Fehling's solution is a chemical reagent used to test for the presence of reducing sugars and aldehydes. It contains copper(II) ions (Cu²⁺) complexed with tartrate ions in an alkaline solution.

**Hint:** Fehling's solution is primarily used to test for aldehydes, which can reduce copper(II) ions.

### Step 2: Identify the Reaction
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