Explaining ferromagnets-antiferromagnets and ferrimagnets

Question1) Answer all the questions:

a) SO3 has zero dipole moment. Why?

b) What are the significant consequences of schottky and Frenkel defects?

c) With the help of electron spin, differentiate between ferromagnets, antiferromagnets and ferrimagnets.

d) Explain the hydrogen bonding with suitable examples.

e) Give the reason why XeF4 is square planar while CF3 is tetrapedral.

Question2) Give the example of Diels-Alder reaction.

Question3) Write detail notes on :

i)  Semiconductors.

ii) Lattice defects.

Question4) Write detail note on flurocarbons.