rrange the following compounds in decreasing order of reactivity towards nucleophilic addition reaction: I) C 6 ​ H 5 ​ COCH 3 ​ II) CH 3 ​ −COCH 3 ​ III) CH 3 ​ −CHO

Explanation

To arrange the given compounds in decreasing order of reactivity towards nucleophilic addition reactions, we will analyze the structures and the factors affecting the electrophilicity of the carbonyl carbon in each compound.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- I) C₆H₅COCH₃ (Acetophenone)
- II) CH₃COCH₃ (Acetone)
- III) CH₃CHO (Acetaldehyde)
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