7. (4) Assumi triplet in the NMR s ng equivalent J values, which lettered proton

Question

7. (4) Assumi triplet in the NMR s ng equivalent J values, which lettered protonís) of the following compound would occur as a pectrum? 0% 00% a. the proton(s) on carbon a. b. the proton(s) on carbon b. c. the proton(s) on carbon c. on 8. (4) The "extra" orbital of the methyl carbanion, CH3, a. is sp2 hybridized and contains I electron. b. is sp2 hybridized and contains 2 electrons. d. is sp3 hybridized and contains 2 electrons 9. (4) The hybridization of the central carbon (bold) in the molecule methyl isocyanate CH,N-C-Oi b. sp c. sp d. sp 10. (4) Which of the following dimethylcyclohexanes is the most thermodynamically stable? a. 1.2-cis b. 1,3-trans c) 1,4-trans . 14-cis 11. (4) What is a satisfactory reagent to convert rans-2-butene into meso-2.3-butanediol? CH3 HOH 0% CH3 CH3 -9s@tfollowedby-KHso, b. dilute KMnO4 c. H,IO/HOAc d. none of the above reaction conditions will do the job.

Explanation / Answer

7 c. the protons on carbon C because it has adjacent carbon aton comprising two H atoms, so apply n plus 1 rule, 2 plus 1 is equal to 3, i.e, triplet.

11. c is the answer, because both OsO4 and KMnO4 results cis dihydroxylation, which would give cis diol.

the meso pdt contains trans OH grs, so ans is C

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