**Category:** Organic Chemistry  
**Subtype:** Hydrolysis Reactions  
**Problem Description:** Determine how many substances in the given list produce alcohol when hydrolyzed in excess NaOH at a specific temperature.  

**Substances in the list:**  
1. Vinyl acetate  
2. Methyl formate  
3. Phenyl acetate  
4. Tristearin  

**Task:** Count the number of substances that yield alcohol upon hydrolysis.