CHEM 237 Final Review TAMU Questions and Answers Already Graded A

CHEM 237 Final Review TAMU Questions and Answers Already Graded A Which reagent is not an oxidizing agent? a. NaOCl b. KMnO4 c. K2Cr2O7 d. CrO3 e. H2O H2O Which statement is false about preparing alkyl halide from alcohol with hydrogen halide? a. it is an SN1 reaction b. tertiary alcohols react faster than secondary alcohols c. the intermediate is a carbocation d. alkyl halide is soluble in conc. HCl e. in the reaction, the slowest step is the formation of a carbocation alkyl halide is soluble in conc. HCl 2‐Chloro‐2‐methylpentane was treated with conc. NaOH to generate products of E2 elimination. If 12 grams of the alkyl halide was used and 6.2 grams of alkene product was obtained, what was the percent yield for the reaction? (Atomic weights: C - 12; H - 1; Cl - 35.5) a. 70% b. 74% c. 52% d. 67% e. None of the above 74% During the purification of allyl‐2‐naphthyl either in the phase transfer catalysis experiment, some products were retained the in the silica gel mini‐column. What is the nature of these retained products? a. non‐polar b. polar c. basic d. acidic e. none of the above polar In a thin layer chromatography experiment, a plate 24 cm long was employed and the solvent was allowed to rise 20 cm. Two spots were observed which had moved 8 cm and 12 cm. Their respective Rf values are: a. 0.33 and 0.50 b. 1.00 and 1.50 c. 0.67 and 1.00 d. 8.00 and 12.00 e. 0.40 and 0.60 0.40 and 0.60 In the distillation of hexane/heptane and hexane/octane mixtures, the early distillation fractions contain higher percentages of hexane because: a. hexane reacts with oxygen faster b. heptane and octane sticks to the distillation vial c. hexane has a higher vapor pressure d. the vapors of heptane or octane escaped and did not condense e. heptane and octane have higher vapor pressures hexane has a higher vapor pressure IR Spectroscopy is useful in the analysis of carbonyl compounds because: a. the carbonyl group is chiral b. carbonyl compounds are brightly colored c. the C=O bond is a strong absorber of particular frequencies of infrared radiation d. carbonyl groups emit characteristic frequencies of infrared radiation e. carbonyl rotational states are closely packed the C=O bond is a strong absorber of particular frequencies of infrared readiation Which of the following would be the reagent reacted with a secondary alcohol to produce a ketone? a. O3; Zn, H3O+ b. OsO4 c. LiAlH4 d. NaOCl + CH3CO2H e. Ag(NH3)2+ NaOCl + CH3CO2H Which of the following compounds would you expect to undergo an SN1 reaction with HCl the fastest? a. sp3 primary alcohol b. sp3 secondary alcohol c. sp3 tertiary alcohol d. sp2