CHEM 210 Exam 3 Complete Study Questions with Verified Answers

CHEM 210 Exam 3 Complete Study Questions with Verified Answers 1. T/F the amino acids serine and threonine both contain sulfur atoms - ANSWER false 2. Which reactions favor heat? (entropically favored) - ANSWER Elimination 1/2 3. rate determining step - ANSWER the slowest step in a reaction mechanism, carbocation formation 4. SN2 - ANSWER one step reaction, inverted stereochemistry, no carbocation, no intermediates 5. the more s character a carbocation has, the _____stable it is - ANSWER less 6. when looking at an epoxide, the orientation around the oxygen is _________ the orientation around the double bond in the reactant - ANSWER the same as 7. when added with base makes an epoxide - ANSWER BrOH 8. adds 2 Brs in anti conformation - ANSWER Br2 9. produces a Z alkene from an alkyne (adds 2 Hs in syn) - ANSWER lindlar catalyst 10.2 ways of producing an oxidation reaction - ANSWER add more electronegative atom, add pi bond 11.2 ways of producing a reduction reaction - ANSWER remove electronegative atom, remove pi bond this reaction occurs there is a scrambling of dashes and wedges (not just anti or syn, no fixed relationship) - ANSWER HBr the product has more carbons than the reactant, this reaction is needed - ANSWER triple bond (base) reaction the reactant only has carbons and hydrogens, this reaction will occur first - ANSWER radical halogenation the product has less carbons than the reactant, one of these reaction is needed - ANSWER O3/Zn or OsO4/NMO/HIO4 two reactions cleaves c-c bonds - ANSWER O3/Zn and OsO4/NMO/HIO4 forming a double bond, this reaction is needed - ANSWER elimination es an E alkene from an alkyne (adds 2 Hs anti) - ANSWER Li/NH3 through double bonds and adds oxygen to them - ANSWER ozonolysis lower the BDE for H-X*, the ______ reactive X* is, and the ______ selective X* is - ANSWER less, more an X-OH reaction, the X bonds to the _____ substituted carbon and the OH bonds to the _____ substituted carbon - ANSWER less, more reacts with triple and double bonds to form hydrocarbon chains in hydrogenation reactions - ANSWER H2 ic position is - ANSWER carbon next to double bond 24.In a halohydrin reaction, the ___ is the electrophile and the ____ is the nucleophile - ANSWER halogen, OH 25.a halohydrin reaction adds a halogen and an OH in ____ formation - ANSWER anti 26.Oxymercuration is a ____ formation addition of ____ - ANSWER anti, water 27.BH3 reaction is a ____ formation addition of _____ - ANSWER syn, water reduction of alkenes, ______ are added in ______ formation by attachment to ____ - ANSWER 2 Hs, syn, Pd des formed from mCPBA and BrOH are a pair of - ANSWER diasteriomers d to create a trans diol - ANSWER epoxide, water and H+ d to create a cis diol - ANSWER epoxide, cat OsO4, NMO, water ion of HBr to a terminal alkyne gives a - ANSWER gem-dibromide 33.Br2 is added to an internal alkyne in a ______ formation - ANSWER trans rcuration of terminal alkynes gives - ANSWER methyl ketones rcuration of internal alkynes gives - ANSWER mixture of little use boration (BH3 reaction) of terminal alkynes gives - ANSWER aldehydes of atoms within a molecule - ANSWER tautomerization e with alcohol attached is an - ANSWER enol onal group with O=C-H - ANSWER aldehyde ional group with C=O - ANSWER ketone