12: C ; why?

30: why is the answer D and not B or C?

PQ-12. Which structure is consistent with this 'H NMR spectrum? 4 3 2 0 PPM HC to CH3 () () . 4 CH3 \t () HC CH3 d (D) Spectroscopy Exams 100 PQ-30. An unknown compound was found to be unreactive towards chromic acid (Jones' reagent = CrO3, aqueous H2SO4, acetone) and gave this IR spectrum. What is the structure of the compound? 50 1000 500 0 4000 3000 2000 1500 WAVENUMBERS CH3 OH (B) CH3 CH3 OH OH (D) PQ-12. Which structure is consistent with this 'H NMR spectrum? 4 3 2 0 PPM HC to CH3 () () . 4 CH3 \t () HC CH3 d (D) Spectroscopy Exams 100 PQ-30. An unknown compound was found to be unreactive towards chromic acid (Jones' reagent = CrO3, aqueous H2SO4, acetone) and gave this IR spectrum. What is the structure of the compound? 50 1000 500 0 4000 3000 2000 1500 WAVENUMBERS CH3 OH (B) CH3 CH3 OH OH (D)