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Observation Exercise Based On Organic Chemistry

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Introduction

OBSERVATION EXERCISE BASED ON ORGANIC CHEMISTRY: You are provided with three organic compounds H, I and J. H, I and J each belong to different homologous series. Carry out the reactions below and record your observations. In each case make what deductions you can about the functional group in the compound under test. 1.In a fume cupboard. Lace 3 drops of H on a piece of broken pot or a crucible lid and try to ignite it with a wooden splint. Observation Inference The splint ignites, and all of H is burned, leaving no excess liquid, but a yellow mark no the crucible lid. There are double bonds present, which shows that solution H is unsaturated therefore H could be an alkene. ...read more.

Middle

This in an oxidation reaction -Unsaturated hydrocarbon. 4. In a fume cupboard. Place 3 drops of I on a piece of broken pot or a crucible lid and try to ignite it with a wooden splint. Observation Inference The flame was of a faint blue colour, there was no soot produced and there was a strong smell present. Saturated hydrocarbon 5. Place 1cm3 of I in a tube and add 1cm3 of dilute sulphuric acid and 10 drops of potassium manganate (VII) solution. Heat the mixture using a water bath. Observation Inference The solution went cloudy when sulphuric acid was added, and orangey brown when potassium added. When heated the orange colour disappears- Decolourisation Potassium manganate is an oxidising agent, and the solution turns almost clear on heating, this shows that a reducing agent is also present. Oxidation has taken place. ...read more.

Conclusion

Place 1cm3 of J in a test tube, add an equal volume of bromine water, cork the tube and shake the mixture. Observation Inference After shaking the mixture, a red layer if formed at the top of the solution and a pale yellow underneath. Underneath is the organic compound and on top sits the bromine water. No double bonds present. It could be a hydrocarbon or an ester. 9. Place 1cm3 of J in a tube add an equal volume of dilute sulphuric acid and 10 drops of dilute potassium manganate (VII) solution. Shake the mixture. Observation Inference There is a dark layer at the bottom and a layer of clear organic compound on top. This shows that the substance is not a reducing agent and has saturated hydrocarbons. Highly saturated aliphatic hydrocarbon. Formulae of: H= alkene I= primary alcohol J=alkane BY HARKIRAT SINGH SOHAL ...read more.

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