p-BLOCK ELEMENTS GROUP 14(CARBON FAMILY)
Structure, properties and uses of Allotropes and Oxides of carbon
Carbon Allotropes :
ii) Amorphous :
ex : Coke, Coal ---- etc
sp3 - hybridisation
Bond angle is 109°28'
Bond length is 1.54Å
strong covalent bonds
Bond length 1.4Å
Strong covalent with hexagonal rings.
- Used as electrode
- used in lead pencil (% of lead is zero)
- Good conductor of electricity
- Thermodynamically more stable
Fullerenes : (C60)
Heating of graphite in an electric cork in the presence of inert gases such as He/Ar then sooty material formed by condensation of vapourised Cn molecules consists mainly C60 called fullerens.
It has cage like structure
C60 shape - Soccer ball / foot ball
It contains 20 - 6 membered rings
12 - 5 membered rings
It is also called as Buckminster fullerene / Bucky ball.
View the Topic in this Video from 0:07 to 16:25
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