(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)
A .................... precipitate is obtained on adding iodine and sodium hydroxide to..........

Explanation

To solve the question, we need to identify the substance that, when treated with iodine and sodium hydroxide, produces a yellow precipitate. The substance in question is acetone.

### Step-by-Step Solution:

1. **Identify the Reaction**: The question involves a reaction where iodine (I2) and sodium hydroxide (NaOH) are added to a compound to produce a precipitate. The key compound that reacts with iodine and NaOH to produce a yellow precipitate is acetone.

2. **Write the Chemical Equation**: The reaction of acetone (CH3COCH3) with iodine and sodium hydroxide can be represented as follows:
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