CHEM301 F10 CA6 key

CHEM301 F10 CA6 key - CHEM301 Fall 2010 Dr Ruder 1 Class...

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Unformatted text preview: CHEM301, Fall 2010 Dr. Ruder 1 Class Activity 6 Radical Halogenation Reactions Model 1: Heterolytic and Homolytic Bond Cleavage. When compounds react, bonds are broken and formed. Bond breakage can be heterolytic or homolytic as outlined below. X Y X + Y heterolytic X Y X + Y homolytic Questions 1. (a). Describe what happens to the electrons that make up the X-Y bond during heterolytic bond cleavage in Model 1. The pair of electrons in the sigma bond is transferred to one of the atoms making up the bond. (b). Explain what a full arrow (double barbed) illustrates. A full arrow depicts movement of a pair of electrons. 2. (a). Describe what happens to the electrons that make up the X-Y bond during homolytic bond cleavage in Model 1. A single electron is transferred to each of the atoms making up the original sigma bond. (b). Explain what a half arrow (single barbed) depicts. A half arrow depicts movement of one electron. 3. A radical species is a species that has an unpaired electron. Circle any radicals in Model 1. Model 2: Radical Bond Formation. Homolytic bond cleavage results in formation of radical species. Once a radical species is formed, it can form a new bond by combining with another radical, or reacting with one electron of a sigma bond. X Y Z X Z Y + X Y X Y Questions 4. (a). Describe what is different about how the bonds are forming in the reactions of Model 2. Two electrons are combining, one from each radical species, to form a single bond in the top reaction. Two electrons are combining, one from a radical species, and one from a sigma bond, to form another single bond, in the bottom reaction....
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CHEM301 F10 CA6 key - CHEM301 Fall 2010 Dr Ruder 1 Class...

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