Show the polarisation of carbon-magnesium bond in the following structure:
`CH_3 CH_2 - CH_2 Mg X`.

Explanation

To show the polarization of the carbon-magnesium bond in the structure `CH3 CH2 - CH2 MgX`, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure**: The given structure is `CH3 CH2 - CH2 MgX`. Here, `CH3`, `CH2`, and `CH2` are part of an alkyl chain, and `MgX` represents a magnesium atom bonded to a halogen or another electronegative atom (X).

2. **Understand Electronegativity**: Electronegativity is the tendency of an atom to attract electrons towards itself. In this case, carbon (C) is more electronegative than magnesium (Mg).

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