2. Which of the ollowing compounds will have odd m\'z value for the molecular io

Question

2. Which of the ollowing compounds will have odd m'z value for the molecular ion? N. E. all of them A.I D. IV Which molecular formula is consistent with the following mass spectral data? M". at me-84, relative height-10.0% 23. (M+ 1).. at m/2-85, relative height-0.56% A. CsHioO B. CH.O 24. Which of the following will produce M and (M-2y. peaks of equal intensity? D, oxygen E, B and C A. nitrogen B. chlorine C. bromine 25. Which of the m/z values corresponds to the base peak in the following mass spectrum? A. 45 B. 44 C. 29 D. 15 E. 30 26. Which of the following is true about the number of signals in a 'H NMR spectrum? A. it indicates the number of neighboring protons B. it indicates the electronic envi C. it indicates the number of different kinds of protons E. it indicates the electronic environment of neighboring protons D.it indicates the number of protons in the signal 27. Which of the following is true about the area under each signal in a 'H NMR spectrum? A. it indicates the number of neighboring protons B. it indicates the electronic environment of neighboring protons C. it indicates the number of different protons D. it indicates the electronic environment of absorbing protons E. it indicates the relative number of protons in the signal 27. Which of the following typets) of protons are chemically non-equivalent? A. homotopic B. enantiotopic C. diastereotopic 28. Protons H, and H, in the following compound are A. homotopic B. enantiotopic C. diastereotopic D. mesotopic E. none of these

Explanation / Answer

22. Option B, a/c to Nitrogen rule, compounds with odd no of nitrogen have odd m /Z value

23. Option B, C5H8O(5X12+16+8)and Oxygen with O17 =m/z-85

24. Option C, Br at 79 & 81

25. Option C, 29, base peak is the one which has 100% intensity

26. Option C, no of non equivalent Hydrogens

27. Option E, B and C they are different Hydrogens

28. Option A, homotopic, since equivalent Hydrogens

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