Cannizzaro reaction is given by aldehydes which do not have_____.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Cannizzaro Reaction:**
The Cannizzaro reaction is a chemical reaction that involves the disproportionation of aldehydes in the presence of a strong base, typically concentrated sodium hydroxide (NaOH).

2. **Identifying the Aldehydes:**
This reaction is specific to certain aldehydes. To participate in the Cannizzaro reaction, an aldehyde must lack certain structural features.

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