Identify electrophilic centre in the following :
(1) `CH_3CH=O`
(2) `CH_3-CN`
(3) `CH_3 I`.

Explanation

To identify the electrophilic centers in the given compounds, we need to understand what an electrophile is. Electrophiles are species that are electron-deficient and are attracted to electron-rich centers. Let's analyze each compound step by step:

### Step 1: Analyze `CH3CHO` (Acetaldehyde)
1. **Structure**: The compound has a carbonyl group (C=O) with a methyl group (CH3) attached to the carbonyl carbon.
2. **Electronegativity**: Oxygen is more electronegative than carbon, which means it pulls electron density towards itself.
3. **Partial Charges**: This results in the oxygen gaining a partial negative charge (δ-) and the carbonyl carbon gaining a partial positive charge (δ+).
4. **Electrophilic Center**: The carbonyl carbon (C=O) is the electrophilic center because it is electron-deficient.

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