In Canizzaro reaction, HCHO reacs in presence of_______.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Canizzaro Reaction**: The Canizzaro reaction is a chemical reaction that involves the disproportionation of aldehydes that do not have alpha hydrogen atoms. This means that the aldehyde can undergo both oxidation and reduction in the presence of a strong base.

2. **Identifying the Reactant**: In this case, we are specifically looking at formaldehyde (HCHO), which is an aldehyde that lacks alpha hydrogen atoms.

3. **Identifying the Conditions**: The Canizzaro reaction requires a strong base for the reaction to take place. Common strong bases used in this reaction include sodium hydroxide (NaOH) or potassium hydroxide (KOH).

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