Test for identification of But-2-ene and benzene is (a) Tollen's Reagent test (b) 1 % Alkaline K

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Test for identification of But-2-ene and benzene is (a)...

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Key Concepts

Addition Reactions of Unsaturated Compounds

This concept refers to how unsaturated compounds, particularly alkenes, participate in addition reactions with halogens, such as bromine in water. In such tests, the reagent is decolorized by the addition across the double bond, providing a quick visual indication of unsaturation. These addition reactions are a key tool in qualitative organic analysis for confirming the presence of carbon–carbon double bonds.

Alkene Reactivity with Mild Oxidants

This concept involves the reaction of compounds with carbon–carbon double bonds, such as alkenes, when treated with a mild oxidizing agent like dilute alkaline potassium permanganate. In these reactions, alkenes typically undergo syn dihydroxylation to form diols, and the rapid decolorization of the KMnO4 solution serves as an indicator of unsaturation, differentiating them from more stable compounds.

Aromatic Stability

Aromatic compounds, such as benzene, possess a unique stability due to the delocalization of ? electrons over a cyclic structure. This inherent stability makes them less reactive to mild oxidizing agents or simple addition reactions that are characteristic of alkenes. The resistance of aromatic systems to such tests is used to differentiate them from alkenes in qualitative chemical analyses.

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