ALKYNES.

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Presentation transcript:

ALKYNES

Alkynes Alkynes are hydrocarbons containing triple bonds CnH2n-2

Physical Properties of Alkynes Not soluble in water. They are quite soluble in the usual organic solvents of low polarity Their density less than water. Their boiling points increase as the number of carbons increases. First four members are gases higher alkynes are liquids or solids.

Preparation of Alkynes Dehydrohalogenation of alkyl dihalides

Reactions of metal acetylides with primary alkyl halides

Reaction of water with calcium carbide

Reactions of Alkynes Addition reactions Addition of hydrogen

Addition of halogens

Addition of halogens

Addition of hydrogen halides

Oligomerization

Aromatic Hydrocarbons Aromatic compounds are benzene and benzene like compunds in terms of chemical behaviour

Nomenclature of benzene derivatives chlorobenzene nitrobenzene

Aniline Amino benzene Toluene Methyl benzene

Phenol Benzoic acid

Benzenesulphonic acid