14th Group: Carbon Family:

(A) Silicon compounds:

(1) Silicon and Its Compounds:

(2) Silicon Oxide : Silica (SiO2):

(3) Silicon Carbide(SiC): Carborundum:

(4) Silicates (SiO4)-4: salts of silicic acids:

(5) Silicones:(R2SiO with-Si-O-Si- Linkage):

Illustrative Examples:

(1) Why are the properties of CO2 and SiO2 different?

(2) Why does SiCl4 undergo hydrolysis whereas CCl4 doesn't?

(3) What are most common cyclic meta silicates?

(5) What are the Silicones? Give one example one cyclic Silicone?

(6) What are the hydrolysis products of urea ?

(7) Why CO2 is a gas, but SiO2 is a high melting solid?.

(8) Arrange the silicon halides into decreasing order of Lewis acids Character? SiF4, SiCl4, SiBr4, SiI4

(10) CCl4 can not be hydrolysed but SiCl4 can be. Why?

(11) Silianol (SiH3OH) is more acidic than methanol (CH3OH) why?

(B) Carbon Allotropes and compounds:

(1) Structure of Diamond:

(2) Structure of Graphite:

(3) Structure of Fullerences:

Illustrative Examples:

(1) What happened when Graphite treated concentrated acids like HNO3/HF or KMnO4 ?.

(2) Graphite is considere, thermodynamically the most stable allotrope of carbon why ?

(3) Why the C-C bond length in graphite is shorter than C-C bond length of diamond?

(4) All the carbon atom of fullerenes (C60) are equivalent but all C-C bond are not equivalent why ?

(5) Is all the C-C bond length in fullerene is equal ?

(6) How many six membered ( hexagons) and five membered (Pentagons) carbon ring present in (C60) fullerene ?.

(7) Buckminsterfullerene: Bucky Balls: Allotrope of Carbon:

(8) How to prepared Carbon Suboxide (C3O2) ?