FUNCTIONAL GROUP
 
 
 
FUNCTIONAL GROUP
An atom or group of atoms or radical which is responsible for the entire
chemical properties of an organic compound is called a functional group.

OR
An atom or group of atoms in a molecule that gives the molecule
its characteristic chemical properties is called a functional group.

OR
Active part of an organic compound which takes part in chemical reaction is always a functional group.
Generally an organic compound is composed of two parts.
Hydrocarbon part
Active part
Hydrocarbon part of an organic compound is chemically inert and the other part which is active is called functional group.
ORGANIC COMPOUNDS AND THEIR FUNCTIONAL GROUPS
Homologous series
Functional group
Example
Alkanes
None
CH4, C3H8
Alkenes
Double bond
C2H4 , C3H6
Alkynes
Triple bond
C2H2, C3H4
Alcohols
Hydroxyl group (-OH)
C2H5OH, CH3OH
Alkyl Halides
Halide group (-X)
C2H5Cl
Amines
Amino group(-NH2)
C2H5NH2
Aldehydes
COH
CH3-COH, C2H5-COH
Ketones
(-CO-)
CH3-CO-CH3
Carboxylic acids
(-COOH)
CH3COOH
Ethers
(-O-)
CH3-O-CH3
Esters
(-COOR)
CH3COOC2H5
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CRACKING
When high molecular weight long chain alkanes are subjected to heat above their boiling point, they are broken down to produce smaller alkanes, alkenes and hydrogen. This thermal decomposition is called "cracking".
Cracking involves splitting of larger alkanes of less volatile in to smaller molecules of high volatility on heating at high temperature and pressure in the presence of catalyst.
TYPES OF CRACKING
THERMAL CRACKING.
CATALYTIC CRACKING
CATALYTIC CRACKING
In catalytic cracking, a catalyst such as silica or aluminum or zeolite is used.
THERMAL CRACKING
2CH3-CH2-CH3 CH3-CH=CH2 + CH2=CH2+CH4 +H2
INDUSTRIAL APPLICATIONS OF CRACKING
Gasoline Production.
Petrochemical Production.
Fuel gas Production.
Synthetic petrol Production.
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