: Describe simple chemical tests (if any) that would distinguish between: (a) styrene and ethylbenzene; (b) styrene and phenylacetylene; (c) allylbenzene and 1 -nonene; (d) allylbenzene and allyl alcohol \(\left(\mathrm{CH}_{2}=\mathrm{CH}-\mathrm{CH}_{2} \mathrm{OH}\right)\). Tell exactly what you would do and see.

Short Answer

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(a) To distinguish between Styrene and Ethylbenzene, perform a Bromine water test. Styrene decolorizes the brown bromine water, while Ethylbenzene does not. (b) To distinguish between Styrene and Phenylacetylene, perform Baeyer's test using dilute potassium permanganate. The solution turns brown with Styrene but remains purple with Phenylacetylene. (c) To distinguish between Allylbenzene and 1-Nonene, perform a Ferric chloride test. Allylbenzene will give a negative result (no color change), while 1-Nonene remains unaffected. (d) To distinguish between Allylbenzene and Allyl Alcohol, perform the Lucas test using Lucas reagent. Allyl alcohol reacts to form a turbid solution or a separate layer, while Allylbenzene remains clear.

Step by step solution

01

(a) Distinguishing between Styrene and Ethylbenzene

Styrene has a vinyl group (\(CH_2=CH-\)) and Ethylbenzene doesn't. This difference allows for a Bromine water test, where the Bromine adds across the double bond. Procedure: Add bromine water to separate samples of Styrene and Ethylbenzene. Result: Styrene decolorizes the brown bromine water because of the addition reaction that occurs at the double bond. Ethylbenzene, which has no such double bond, does not react; thus, the bromine water retains its brown color.
02

(b) Distinguishing between Styrene and Phenylacetylene

Styrene has an alkene group, while Phenylacetylene has an alkyne group. This difference provides the basis for a Baeyer's test. Procedure: To separate samples of Styrene and Phenylacetylene, add dilute potassium permanganate solution. Result: The solution turns from purple to brown with Styrene (indicating a positive test for an alkene), but it remains purple with Phenylacetylene since alkyne groups are resistant to oxidation under these mild conditions.
03

(c) Distinguishing between Allylbenzene and 1-Nonene

Allylbenzene is an aromatic compound, while 1-nonene is an alkene. You can distinguish between them using the Ferric chloride test, which tests for phenols. Procedure: Add a few drops of Ferric chloride solution to separate samples of Allylbenzene and 1-Nonene. Result: Allylbenzene will give a negative result (no color change), as there is no phenol group, while 1-Nonene will remain unaffected.
04

(d) Distinguishing between Allylbenzene and Allyl Alcohol

Allylbenzene is an aromatic compound, whereas allyl alcohol is an alcohol. They can be distinguished using the Lucas test which is for alcohols. Procedure: Add Lucas reagent (a solution of Zinc chloride in concentrated Hydrochloric acid) to separate samples of Allyl benzene and Allyl alcohol. Result: Allyl alcohol reacts with Lucas reagent to form a turbid solution or a separate layer (as indication of the presence of a secondary or primary alcohol, respectively), while Allylbenzene remains clear (no reaction) because it does not have a hydroxyl group.

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