Write the state of hybridisation of
boron in `BCl_3`

Explanation

To determine the state of hybridization of boron in \( BCl_3 \), we can follow these steps:

### Step 1: Identify the Valence Electrons
Boron (B) has 3 valence electrons, and each chlorine (Cl) atom has 7 valence electrons. Since there are three chlorine atoms, the total number of valence electrons contributed by chlorine is \( 3 \times 7 = 21 \) electrons.

### Step 2: Determine the Total Number of Valence Electrons
The total number of valence electrons in \( BCl_3 \) can be calculated as follows:
\[
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