In carbonyl compounds the carbon atom involves ....... hybridisation.

Explanation

To determine the hybridization of the carbon atom in carbonyl compounds, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Structure of Carbonyl Compounds**:
Carbonyl compounds generally have the structure R-C(=O)-R', where R and R' can be hydrogen or hydrocarbon groups. The carbon atom of interest is the one that is double-bonded to the oxygen atom.

2. **Count the Valence Electrons of Carbon**:
...