On the basis of VSEPR theory, predict the shapes of given molecules: PCl₅ and SF_6.

Discuss the shape of the following molecules using VSEPR model:
BeCl₂, BCl₃, SiCl₄, AsF₅, H₂S, PH₃

State and explain hybridisation.

What are the necessary conditions for hybridisation?

What are the different types of hybridisation in s and p atomic orbitals?

Discuss in brief sp³ hybridisation. Explain the formation of methane and ethane.

Discuss in brief sp² hybridization (hybridization in C = C bond). Discuss the molecular orbital structure of ethylene (first member of alkene).

Or

Draw diagrams showing the formation of a double bond between carbon atoms in C₂H₄.

Apart from tetrahedral geometry, another possible geometry for CH₄ is square planar with four H atoms at the corners of the square and the C atom at its centre. Explain why CH₄ is not square planar?

On the basis of hybridisation, discuss the orbital structure of: (i) BeF₂ (ii) BH3.

180.

The central atoms in CH₄, NH3 and H₂O are all said to have similar hybridisation but the bond angle H – A – H (where A is C, N or O) is different in each case. Explain stating in which case it is maximum and in which case it is minimum.