Which of the following compounds, will have odd m/z value for the molecular ion?

Question

Which of the following compounds, will have odd m/z value for the molecular ion? I II III IV none of the above Compounds containing chlorine or bromine usually show a strong peak. molecular ion M + 1 M + 2 M + 3 all of these Which of the following compounds have the same degree of unsaturation? C_5H_5Br_2NO C_8H_10BrIO C_6H_5Be C_5H_11NO I II III IV I & II I & III III & IV II & III none of these Which of the following is true about the shape of the signal in a H NMR spectrum? it indicates the number of different protons it indicates the electronic environment of neighboring protons it indicates the number of neighboring protons it indicates the electronic environment of absorbing protons it indicates the number of protons in the signal Which of the following it true about the number of signals in a H NMR spectrum? it indicates the number of different kinds of protons it indicates the electronic environment of neighboring protons it indicates the number of neighboring protons indicates the electronic environment of absorbing protons if indicates the number of protons in the signal Protons H_a and H_b in the following compound are. Homotopic Mesotopic Diastereotopic Enantiotopic none of these How many signals would you expect to find in the H NMR spectrum of the following compound? 4 5 6 7 8 Which of the indicated protons in the following compound would appear most downfield in the H NMR spectrum? I II III IV I & III

Explanation / Answer

I will answer for now, question 7. Because I don't have a strong knowledge of NMR spectrum.

So, the degrees of insaturation may be calculated with the following expression:
I = Cn+1 - (H+X-N/2)

Following this formula, and the above condensed formula we have:
I1 = 6 - (5+2-1/2) = 3
I2 = 9 - (10+2/2) = 3
I3 = 7 - (5+1/2) = 4
I4 = 6 - (11-1/2) = 1

So compounds I and II have the same degree of insaturations.

Hope this helps. Post once again your questions in another post to get answered for the others question regardgin NMR spectrum.

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