Organic Chem Exam 3 questions wit answers.

Organic Chem Exam 3 questions wit |\ |\ |\ |\ |\ |\




answers

alkyl halide - CORRECT ANSWERS ✔✔compounds in which
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a halogen is connected to an sp3 hybridized carbon atom
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2 types of rxn's alkyl halides go under - CORRECT
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ANSWERS ✔✔substitution and elimination
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substitution reaction - CORRECT ANSWERS ✔✔when
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treated with a nucleophile, the nucleophile replaces the
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halogen


elimination reaction - CORRECT ANSWERS ✔✔when
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treated with a base, a pi bond will form creating an alkene
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what functions does the halogen serve in an alkyl halide -
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CORRECT ANSWERS ✔✔1) halogen withdraws electron
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density leaving the carbon open to nucleophilic attack
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2)halogen can serve as the leaving group
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what are good leaving groups - CORRECT ANSWERS
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✔✔conjugate bases of strong acids, halogens serve as |\ |\ |\ |\ |\ |\ |\ |\



excellent leaving groups
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,alpha position - CORRECT ANSWERS ✔✔the carbon atom
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connected directly to the halogen |\ |\ |\ |\




beta position - CORRECT ANSWERS ✔✔the carbon atoms
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connected to the alpha position can be up to 3 beta
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positions


organohalide - CORRECT ANSWERS ✔✔a more general |\ |\ |\ |\ |\ |\ |\



term for any organic compound that contains a halogen
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(includes aryl halides and vinyl halides)|\ |\ |\ |\ |\




how are organohalides useful - CORRECT ANSWERS
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✔✔serve as excellent starting materials for more complex
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molecules
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Sn2 - CORRECT ANSWERS ✔✔bimolecular nucleophilic
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substitution with 2nd order kinetics |\ |\ |\ |\




2 mechanisms of Sn2 - CORRECT ANSWERS
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✔✔nucleophilic attack and loss of leaving group |\ |\ |\ |\ |\ |\




stereospecific - CORRECT ANSWERS ✔✔the configuration |\ |\ |\ |\ |\ |\



of the product is dependent upon configuration of the
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reaction

, walden inversion - CORRECT ANSWERS ✔✔inversion of
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configuration, R to S, or S to R. due to back-side attack |\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\




back-side attack - CORRECT ANSWERS ✔✔1) lone pairs of
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the leaving group create high regions of electron density
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that block the front side
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2) a node is present between the alpha carbon and
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halogen that blocks front side attack |\ |\ |\ |\ |\




how does alkyl halide structure effect rate - CORRECT
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ANSWERS ✔✔the presence of substituents at the alpha or
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beta position significantly reduce rate
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what effects rate reaction more, substituents on the alpha
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or beta position - CORRECT ANSWERS ✔✔alpha
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can Sn2 reactions be performed on tertiary alkyl halides -
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CORRECT ANSWERS ✔✔NO |\ |\




will a Sn2 reaction proceed with 3 substituents on the
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beta position - CORRECT ANSWERS ✔✔technically yes,
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but not at a practical rate
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