d. iv 12. Which of the carbon atoms in the molecule appears furthest downfield in the le appears furthest downfield in the "C NMR spectrum? iv d. i The chemical shift of the protons of acetone, CHCOCH, is 2.1 ppm when the spectrum is obtained at 250 MHz. What is the chemical shift of these protons when the spectrum is acquired at 500 MH a. 1.05 ppm b. 2.1 ppm c. 4.2 ppm d. 8.4 ppm 13. -14. What is the hydrogen deficiency index for a compound with a molecular formula of CiaH0? b. 4 c. 5 d. 6 ã¼-15. Which of the following compounds gives a 'H NMR spectrum consisting of only a singlet? a. 1,1-dibromopropane b. 1,2-dibromopropane c. 1,3-dibromopropane d. 2,2-dibromopropane 16. Which CoHioO compound gives the following 'H NMR spectrum? 09. 3 CHEM2425. Review for Test 1 (chapter 12,13.14, 15) Staftforo, Si8