The \'H NMR spectrum of bromoethane shows a signal at 3.5ppm w 60 MHz spectromet

Question

The 'H NMR spectrum of bromoethane shows a signal at 3.5ppm w 60 MHz spectrometer. Where do 26. when the spectrum is recorded using a you expect to see the signal if a 300 MHz instrument is used instead? A) 3.5 ppm 8) 7.5 ppm C) 6.8 ppm D) 5.8 ppm E) none of these would appear most downfield in the 'H NMR Which of the indicated protons in the following compound spectrum? 27. A) I B) C)111 D)IV E) V ula CgHi has the following 'H NMR spectrum. Which of the following is A compound with molecular form the correct number of protons giving rise to each signal? 28. A) 1-3H, II-9H, III-2H B) I-2H, II-9H, III-3H C) 1-4H, 1I-6H, 1I-4H D) none of these 4 PPM 29. Which of the following compounds will display only two singlets in its 'H NMR spectrum? IV A) 1 B) II C)111 D)IV E) v SI P S 3

Explanation / Answer

26. Option A, No change in chemical shift values only change in intensity of signal.

27. Option E, aromatic proton gives signal at more downfield.

28. Option A, since triplet is due to splitting with adjacent 2 hydrogens while quartet is due to 3 adjacent Hydrogens.

Triplet for CH3 & quartet for CH2 & singlet for 9 Hs

29. B, Since it has only two non equivalent Hydrogens. One is for Two methyl group hydrogens attached to ketone and other methyl protons in between ketone groups.

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