Organic Reactions and Chemical Tests
Explore organic reactions and chemical tests including resorcinol fusion, osazone formation, bromination, esterfication, biuret test, dicarboxylation, and diazoreaction. Learn about these reactions and their applications in organic chemistry.
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Presentation Transcript
ORGANIC REACTIONS Name of the instructor: U.Nithya M.Sc.,M.Phil.,
RESORCINOL FUSION TEST: Resorcinol condenses with phthalic an hydride in the presence of concentrated sulphuric acid to give fluoresein. Fluorescein dissolves in alkalies to give a reddish brown solution on dilution the solution gives a strong yellowish green fluorescence. Phthalic unhydride. Resorcinol. Fluoresscein
OSAZONE FORMATION: i)one molecule od phenyl hydrazine condenses with the aldehyde group of glucose and forms the corresponding phenyl hydrazine. ii) when glucose is warmed with excess phenyl hydrazone a second molecule of the phenyl hydrazine oxidises yhe secondary alcoholic group on the carbon atom next to the aldehyde group. The corresponding ketone is formed. iii) Now a third molecule of phenyl hydrazine condenses with this newly producted keto group giving the final product glucosazone.
BROMINATION: Unsaturated compound is react with bromine to get (removal of orange red colour) colourless solution.
ESTERFICATION: Alcohol react with carboxylic acid in the presence of sulphuric acid to give ester.
BIURET TEST: When urea is heated gently it losses ammonia forming a compound called biuret . An alkaline solution of biuret(NaoH)when treated with a drop of Cuso4solution produces a violet colour. This biuret test serves as a confirmatory test for urea (a diamide).
DICARBOXYLATION: When benzoic acid is heated with sodalime (a mixture of caustic soda and quick lime) inflammable vapours of benzene are evolved.
DIAZOREACTION (OR) COUPLING REACTION: When aniline or phonol is reacted with benzene diazonium chloride diazo coupling takes place to given azodyes.
