What is/are the product(s) of the addition of HCl in (E)-penta-1,3-diene. Identify the major product if the condition is: a. at 40 °C b. at 4 °C
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- Draw the structure of (Z)-1-bromo-1-chloro-1-butene. • Consider E/Z stereochemistry of alkenes. • You do not have to explicitly draw H atoms. AAVII ? ChemDoodle [F Ⓡa. How many linear dienes have molecular formula C6H10? (Disregard cis–trans isomers.) b. How many of the linear dienes in part a are conjugated dienes? c. How many are isolated dienes? d. How many are cumulated dienes?Draw the structure of (Z)-4-methyl-2-pentene. • Consider E/Z stereochemistry of alkenes. You do not have to explicitly draw H atoms. opy aste ChemDoodle
- Elimination of HBr from 2-bromobutane affords a mixture of 1-butene and 2-butene. With sodium ethoxide as base, 2-butene constitutes 81% of the alkene products, but with potassium tert-butoxide, 2-butene constitutes only 67% of the alkene products. Offer an explanation for this difference.3. Choose the answer that satisfy each statement. a. Under thermal conditions, (2E,4Z)-hexadiene undergoes a ring closure to form b. Under photochemical conditions, (2E,4Z)-hexadiene undergoes a ring closure to form A) conrotatory, cis-3,4-dimethylcyclobutene B) conrotatory, trans-3,4-dimethylcyclobutene C) disrotatory, cis-3,4-dimethylcyclobutene D) disrotatory, trans-3,4-dimethylcyclobuteneCyclohexene (an alkene) is mixed with potassium permanagnate solution (KMnO4). What do you expect to observe? A. The mixture will turn purple as the permanganate is reduced by the alkene. B. The purple colour will disappear as the permanganate is reduced by the alkene. C. Nothing. Permanganate does not react with alkenes. D. The purple colour will disappear as the permanganate is oxidised by the alkene.
- Which of the following statements is/are TRUE? I. All carbons in 1,3-butadiene are sp2-hybridized. II. Markovnikov rule is followed by the reaction of alkenes with HBr in the presence of peroxides because the carbocation intermediate that is formed is stable. II. Isolated dienes with more than five carbons contain sp sand sp3 - hybridized C atoms. Select one: II I, II II, II O O O O OFill in the following missing organic structures. Consider stereochemistry (R/S and/or E/Z –cis/trans) and possible carbocation rearrangements.1. In which kind of a biomolecule can a photochemical 2 + 2 cycloaddition reaction take place:
- 1. What is the function of CH2Cl2 in the bromination reactions? Why can it fulfill this role?2. In not more than three (3) sentences, explain why terminal alkynes are acidic.3. What impurities are removed when acetylene gas is made to pass through an acidified solution of CuSO4?4. Explain the difference in the rate of free-radical bromination reactions of toluene and cyclohexane.5. Give the reagent or chemical test that would differentiate the following pairs o fcompounds. Provide only the reagents or chemical tests discussed in the module. Write chemical equations for the reactions involved. a. benzene and ethylbenzeneb. 1-butyne and 2-butynec. 2-methylpentane and 2-methyl-2-pentened. toluene and 1-methylcyclohexeneDraw the structure of (E)-3-isopropyl-5,5-dimethyl-2-hexene. - Consider E/Z stereochemistry of alkenes. • You do not have to explicitly draw H atoms.Draw the structure of (Z)-2,3-dichloro-4-methyl-2-hexene. Consider E/Z stereochemistry of alkenes. • You do not have to explicitly draw H atoms. opy aste C ChemDoodle