In case of bond formation in acetylene molecule: State number of sigma and pi bonds formed.

In case of bond formation in acetylene molecule: Name the type of hybridisation.

Define : Bond Enthalpy

Define bond length.

Predict the shape and bond angles in the following molecules: ${\mathrm{CF}}_4$.

Predict the shape and bond angles in the following molecule: ${\mathrm{NF}}_3$.

Predict the shape and bond angles in the molecule: $\mathrm{HCN}$.

Predict the shape and bond angle in the following molecule: ${\mathrm{H}}_2\mathrm{S}$.

Using data from the table, answer the following :

 What happens to the bond length when unsaturation increases?