(Aldol, benzoin, +I, -I, decreases, increases, cyanohydrin, lactic acid, tartaric acid, yellow, white, acetone, penta-3-one, `PCl_(3)`, PCl, benzal chloride, methanol, propanoic acid, ethanol, KOH, KCN, `alpha`-hydrogen atoms, no `alpha`-hydrogens, Cannizzaro's, absence, presence)
Acetaldehyde in presence of NaOH gives ......... and this reaction is called ..........

Explanation

To solve the question "Acetaldehyde in presence of NaOH gives ......... and this reaction is called ..........", we can follow these steps:

### Step 1: Identify Acetaldehyde
Acetaldehyde is a simple aldehyde with the chemical formula CH₃CHO. It is also known as ethanal.

### Step 2: Understand the Reaction Conditions
The question states that acetaldehyde is in the presence of NaOH, which is a strong base. This indicates that we are looking at a reaction that involves a base-catalyzed process.

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