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ISC Class XII Notes 2020 : Chemistry (Assam down town University (AdtU), Guwahati) : neet

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Washim Khan
Assam down town University (AdtU), Guwahati

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18 18 The Chemistry of Aryl Halides, Vinylic Halides, and Phenols. Transition-Metal Catalysis An aryl halide is a compound in which a halogen is bound to the carbon of a benzene ring (or another aromatic ring). I " M i CH2CH3 1-ethyl-2-iodobenzene (an aryl iodide) M i CH2CH2I not an aryl halide; halogen not attached directly to benzene ring In a vinylic halide, a halogen is bound to a carbon of a double bond. H2C A CH L Cl vinyl chloride (chloroethylene) H CH2CH2CH3 ) $ CAC ) $ Br H (E)-1-bromo-1-pentene (a vinylic bromide) Be sure to differentiate carefully between vinylic and allylic halides (p. 788). Allylic groups are on a carbon adjacent to the double bond. Likewise, be sure that the distinction between aryl and benzylic halides is clear. Benzylic groups are on a carbon adjacent to an aromatic ring. 822

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