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Organic Chemistry

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Separation, Purification and Structural Analysis of Organic Compounds

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A set of qualitative experiments were conducted in an organic chemistry lab.

Experiment 1

Chemist 1 treated cyclohexene with 1% aq. KMnO4. One of the products was a cis-glycol.

Experiment 2

Chemist 2 conducted qualitative tests for some carbonyl compounds. Aldehydes and ketones gave a positive test for the reagent 2, 4-dinitro- phenyl hydrazine. The compound tested for the confirmation was propanone. The product formed as a result of this test involving propanone is shown below.

image\Ch 32 Experiment 2.png

Experiment 3

In Experiment 3, three compounds were tested. These three compounds were treated with concentrated hydrochloric acid in the presence of zinc chloride (ZnCl2). Compound A was ethyl alcohol, Compound B was tert-butyl alcohol, and Compound C was 2-propanol. The reactions were based on unimolecular substitution mechanism.

Experiment 4

In Experiment 4, the chemists synthesized the following compound.

image\Ch 32 Expirement 4.png

Which of the following are true for the compound synthesized in Experiment 4?

I. The compound is insoluble in H2O

II. The compound is soluble in 5% aqueous solution of NaOH

III. The compound is an aromatic compound

IV. The compound is a strong base

A I & II only
B I & III only
C II & IV only
D II & III only
Ans. B Since the compound is insoluble in water, statement I is true. Since the compound is insoluble in 5% aqueous sodium hydroxide, statement II is false. Since the compound is an aromatic compound, statement III is true. The compound is not a strong base. Hence, statement IV is false.

Separation, Purification and Structural Analysis of Organic Compounds Flashcard List

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