Draw the structure of `BCl_(3).NH_(3)` and `AlCl_(3)` (dimer).

Explanation

To draw the structures of \( BCl_3 \cdot NH_3 \) and \( AlCl_3 \) (dimer), we will follow these steps:

### Step 1: Draw the structure of \( BCl_3 \)
1. **Identify the central atom**: Boron (B) is the central atom.
2. **Add chlorine atoms**: Boron forms three covalent bonds with three chlorine (Cl) atoms.
3. **Electron deficiency**: Boron has only three valence electrons and forms three bonds, making it electron deficient.

**Structure of \( BCl_3 \)**:
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