Organic Chemistry. Alkynes -Contain carbon-carbon triple bonds -sp-Hybridization -Unsaturated hydrocarbons -C n H 2n-2.

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Presentation transcript:

Organic Chemistry

Alkynes -Contain carbon-carbon triple bonds -sp-Hybridization -Unsaturated hydrocarbons -C n H 2n-2

IUPAC names -Alkynes name are similar to that for alkanes. …………..ane …………..yne

Physical Properties of Alkynes 1.C2-C4GAS C5-C17LIQUID  C18SOLID mp.bp. 2. Ethyne C 2 H Propyne C 3 H Butyne C 4 H

Why ??? 12 bp Cis-isomer  trans-isomer

Isomers Same formula Different structure Different molecule with different properties – must have a different name! Isomers of C 4 H 6

Isomers of C 5 H 8

Reaction of Alkyne 1. Combustion reaction 2. Addition reaction -Hydrogenation reaction (H 2 )Ni, Pd, Pt cat. -Halogenation reaction (X 2 / CCl 4 )

-Hydrohalogenation reaction (HBr) -Hydration reaction (H 2 O) Condition……………….

3. Oxidation reaction

Aromatic Compound 1.The structure must be cyclic, containing some number of conjugated pi bond. 2.HUCKEL’ s rule (4n+2; n=0,1, 2,3,4…) aromatic system 2, 6, 10, 14…)