Question

Chem 233 Exam III (A) October 28, 2019 Page 7 14. Which of the following would an of the following would be the best base for performing the following elimination? A KOCHA B. KOCH(CH) C. KOC(CH.) D. this reaction is not an elimination reaction 15. Which of the following statements is (are) true of Sul reactions of alkyl halides in general? A) The rate of an SNI reaction depends on the concentration of the alkyl halide. B) The rate of an Syl reaction depends on the concentration of the nucleophile. C) Snl reactions of alkyl halides are favored by polar solvents. D) The rate of an Snl reaction depends on the concentration of the alkyl halide and Sul reactii of alkyl halides are favored by polar solvents. E) The rate of an Syl reaction depends on the concentration of the alkyl halide and the concentration of the nucleophile, and Snl reactions of alkyl halides are favored by polar solvents. le of an si kyl halide depends on the 16. The correct IUPAC name for the following compound is: Thethyl Methal A) 4,5-Dimethyl-3-propyl-2-hexene B) 4,5-Dimethyl-3-propyl-1-hexene C) 3-(2,3-Dimethylpropyl)-1-hexene D) 2,3-Dimethyl-4-isopropyl-5-hexene E) 2,3-Dimethyl-4-propyl-5-hexene

Answer 1

1 - Br This is an elimination neaction and for this elimin nation neaction we need a strong lease. Beleen KOCHE , KOCH(CH3)ą, koc(CH3)2 we should use kocity because it is a strong lease among the above three bases. Husetz The negative change in B and a becomes unstable by the I effect of the entz groups. Hence a B and a are creakers bases compared to A. Hence to perform the above elimination reaction coe should use A. KOCH 15.A. The rate of Sn2 reaction depends on the concentration of alkyl halide ... - Im Sw? beaction, R-* + MMO -> BR-Mu txo Stap-I: R-* the con R® + yo step 1: R+ + nuo gast o r-Mu

Since in suh neaction Step-I is the bilis i hate of the heaction n = K[ K[R ] .. For SN? heaction nata depends on the concentration of alkyl halide only. - Statement A is true ... B. The hate of an 3N2 reaction depends on the concentration of nucleophile. The nate exclusively depends on the concentration of alkyl halide not the nucleophile... ... Statement B is Fabe. c. Sap? neactions of alkyl halicles are of worsed by polan solvents. The transition state of the SNa beaction is complete- ly polarised in nature. Moreover the carbon halide bond is also polarised. Moco polar protic - R2 T.s of an sut reaction planta auta solvents has large dipoles moments. They lower the energy of leath the T-S and the starting material. Therefore this lowens the activation

energy, so the reaction goes faster. . Statement (e) is Thure . D. The rate of an syl reaction depends on the Concentration of the alkyl halide and SNI beaction of alkyl halides are favoned by polar solvents -> Tome . E. The nate of an sy 2 neaction depends on the Concentration of the alkyl halide and the Concentration of the nucleophile, the sue heactions of alkyl halides are furoned - Р•lor ...... > False, ... The will be IUPAC name of the above compound 8.4,5 - dimethyl – 3-propyl - 1 - hexene.