Question

What is the hybridisation in the central atom of HCN and predict geometry

Answer 1

Answer:

If there are three groups, the central atom is sp2 hybridized, and if there are four groups, the central atom is sp3 hybridized. As you can see in the Lewis structure for HCN, there are TWO electron groups surrounding the central carbon atom: a single C-H bond and a triple C-N bond.