What stereoisomers are obtained from the reaction of each of the following alkenes with OsO4 followed by aqueous H2O2? a. trans-2-butene             b. cis-2-butene                   c. cis-2-pentene d. trans-2-pentene

What is the relative rate of addition of HBr to A) 1,3-pentadiene, B) 1,4-pentadiene, and C) 1-pentyne? a. A > B > C  b. B > A > C  c. C > B > A  d. C > A > B

Choose the two alkyl bromides and the hydrogenation method that must be used to synthesize these alkenes from acetylene. Enter your answer as two letters in alphabetical order, followed by a number; i.e. ac2, not ca2. Do not use punctuation. Alkyl Halides a. CH3CH₂Br b. CH3(CH₂)4Br c. CH3(CH2)sBr d. CH3(CH₂) Br e. CH3(CH₂)7Br f. CH₂(CH₂) Br g. CH3(CH₂)12Br Hydrogenation Method 1. H₂, Lindlar's catalyst 2. Na, NH3 (1) CH3 Alkene #1: H₂C Alkene #2: H₂C CH3

Choose the two alkyl bromides and the hydrogenation method that must be used to synthesize these alkenes from acetylene. Enter your answer as two letters in alphabetical order, followed by a number; i.e. ac2, not ca2. Do not use punctuation. Alkyl Halides а. СHзCH2Br b. CH3(CH2)4Br c. CH3(CH2)5Br d. CH3(CH2)§Br e. CH3(CH2);Br f. CH3(CH2)¿Br g. CH3(CH2)12Br Hydrogenation Method 1. H2, Lindlar's catalyst 2. Na, NH3 (1) Alkene #1: CH3 H3C bb1 Alkene #2: H3C, CH3 df1

8. Write an equation representing each of the following reactions: a. 1-Heptene+H2O (H+) b. 3-Heptene+H2 c. 2-Methyl-2-hexene+HCI d. 3-Methyl-1,4-cyclohexadiene+C12 e. 2,4-Heptadiene+Br2 f. 3-Methylcyclopentene+H2O (H+)

13 Before you answer this question, please read the following important principle: If a carbocation is formed in the slow step of a reaction, the reactivity of the reactant will be greater if that carbocation is more stable. The question: Which of the following alkenes reacts fastest with HCI? A. D. H₂C=CHCH₂CH₂CH₂ CH3 CH₂CH₂ H H B. H₂C- CH3 C-CH=CH₂ H C. H₂C H H CH₂CH₂

Reactions: Provide the structure(s) of the expected major organic product(s). Show stereochemistry where needed and write NR if there is no reaction. C. a. b. OH Br NaBr 1. TsCl, Pyridine 2. NaCN, DMSO CH3OH

Identify the type of the following reaction: production of trans- and cis-2-butene from 2-chlorobutane a. E2 b. E1 c. SN1 d. SN2

Draw the principal neutral organic product formed by the reaction of 2.3-dimethyl-1,3-butadiene with the given reagents. a. Excess H2 and Platinum catalyst b. 1 mole HCl (product of 1,2-addition) c. 1 mole HCl (product of 1,4-addition)