Question

A alusis - Pre- L 6. Oxidation with Chrome Ald: Diagnosis of Alcohol Touter KNOWN lehet l-propane Reaction observed (chemical equation with structures): 7. Decolorisation of Bromine: Diagnosis of Alkene Test of KNOWN Alkene: cyclohexene Decolorisation of Bromine Test-procedure and observations: Reaction observed (chemical equation, with structures): Unknown Compound Functional Group Tests: Test Sample Number: Procedure, observations, and conclusions for each functional group test performed: Functional Group of Unknown: Molecular Weight of Unknown (high low): -
just “Reaction observed” for 6 and 7

Answer 1

chromic acid test of observation and procedure,

This test is based on the reduction of chromium(IV), which is orange, to chromium(III), which is green, when an alcohol is oxidized by the reagent. A change in color of the reagent from orange to green represents a positive test. Primary alcohols are oxidized by the reagent to carboxylic acids; secondary alcohols are oxidized to ketones. Tertiary alcohols are not oxidized at all by the reagent. Hence, this reaction can be used to distinguish tertiary alcohols form primary and secondary alcohols. Unlike some other tests for alcohols, this test can be used with all alcohols, regardless of molecular weight and solubility. Aldehydes are also result in a positive chromic acid test.

Procedure: Dissolve 3-4 drops of a liquid alcohol in 1 mL of acetone. Add 2 drops of chromic acid reagent and note the result that occurs. A positive test for a primary or secondary alcohol is the appearance of a blue-green color. Tertiary alcohols do not produce the test result, and the solution remains orange. Record your observations. Perform this test on 1-propanol, 2-butanol, phenol, propanal, and your unknown.

decolorisation of bromine test procedure and observation,

In a test tube, dissolve 2 drops of the cyclohexene in 10 drops of dichloromethane. Add a solution of bromine in dichloromethane (located in the hood), dropwise. Observe the result. For comparison, repeat the test using the saturated alkane in place of the alkene. Bromine is highly toxic and can cause severe skin burns. Wear disposable gloves to avoid skin contact with the bromine solution, and do not breathe the vapors. Work in a hood. Waste Disposal Discard the tube contents in the waste bottle for halogenated organic liquids provided.