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AAt the beginning of 19 th century organic compounds were defined as CCompounds directly or indirectly obtained from plants and animals are called.

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Presentation on theme: "AAt the beginning of 19 th century organic compounds were defined as CCompounds directly or indirectly obtained from plants and animals are called."— Presentation transcript:

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2 AAt the beginning of 19 th century organic compounds were defined as CCompounds directly or indirectly obtained from plants and animals are called as organic compounds CCompounds obtained from minerals are called as inorganic compounds AA change in defination took place by synthesis of an organic compound from an inorganic compound WWOHLER converted AAmmonium cyanate to Urea ((inorganic compd) (org compd) NNew defination

3 CCompounds containing covalently bonded carbon atom or atoms are called as organic compounds CCarbon is covalently bonded with hydrogen oxygen, halogens, and sometimes with nitrogen and sulphur. CCarbon atomic no 6 shows EC :s 2,4 VValency = 4 SSimilarly NNitrogen’s valency = 3 OOxygen’s valency = 2 HHydrogen valency = 1

4  They have low melting and boiling points  They are generally insoluble in water but soluble in organic solvents  They are poor conductors of heat and electricity

5 MMethane(CH 4 ) IIn this compound one carbon atom is covalently bonded to 4 hydrogen atoms CC(2,4) H(1) EElectron-dot cross  structure SStructural formula MMolecular formula

6 OOxygen molecule(O 2 ) contains 2 covalently bonded oxygen molecule. OO(2,6) EElectron-dot cross tructure SStructural formula MMolecular formula

7 NNitrogen molecule(N 2 ) contains 2 covalently bonded nitrogen atoms NN(2,5) EElectron-dot cross SStructure SStructural formula MMolecular formula

8 TTetra valency C(2,4) shows valency=4 MMultiple bonding It can form carbon to carbon Single bond C - C Double bond C = C Triple bond C ≡ C

9 Catenation TThe property of direct bonding between atoms of same element to form a chain is known as catenation. TThe remarkable property of carbon atom to form bonds with itself and give rise to a single large struture or chain is called catenation. TThe chain can be straight chain, branched chain or may have network like structure  Straight chain branched chain network like struture EEg


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