What are hybridisation states of each carbon atom
in the following compounds ?
`CH_(2) = C = O, CH_(3)CH = CH_(2), (CH_(3))_(2)CO,
CH_(2) = CHCN,C_(6)H_(6)`.

Explanation

To determine the hybridization states of each carbon atom in the given compounds, we will analyze the bonding and the steric number of each carbon atom. The steric number is calculated as the number of sigma bonds plus the number of lone pairs around the carbon atom.

### Step-by-Step Solution:

1. **Compound: CH₂=C=O**
- **Carbon 1 (C1)**: This carbon is bonded to two hydrogens and has a double bond with the second carbon (C2).
- Sigma bonds: 2 (with H) + 1 (with C2) = 3
- Hybridization: **sp²**
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