Arrange the following in the increasing order of their reactivity in nucleophilic addition reactions : `C_6 H_5 CHO,C_6H_5 COCH_3, C_6 H_5 COC_6 H_5 `

Explanation

To determine the increasing order of reactivity in nucleophilic addition reactions for the compounds \( C_6H_5CHO \) (benzaldehyde), \( C_6H_5COCH_3 \) (acetophenone), and \( C_6H_5COC_6H_5 \) (benzophenone), we need to analyze the structure of each compound and how the substituents affect the electrophilicity of the carbonyl carbon.

### Step-by-Step Solution:

1. **Identify the Compounds:**
- \( C_6H_5CHO \): This is benzaldehyde, which has a carbonyl group (C=O) directly attached to a benzene ring.
- \( C_6H_5COCH_3 \): This is acetophenone, which has a carbonyl group attached to a benzene ring and a methyl group (CH₃).
- \( C_6H_5COC_6H_5 \): This is benzophenone, which has a carbonyl group attached to two benzene rings.
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