The muss spectrum indicates the presence of ______ in the compound. a. S b. CI c
ID: 527817 • Letter: T
Question
The muss spectrum indicates the presence of ______ in the compound. a. S b. CI c. Br d. I In a 300 - MHz NMR spectrometer, the protons in iodomethane absorb at the chemical shift of 2.17 ppm downfield from TMS. What would be the chemical shift of these protons in a 60 - MHz NMR spectrometer? 2.17 ppm b. 0 ppm c. 0.434 ppm d. 10.85 ppm How many different kinds of protons are there in the following compound? a. 2 b. 3 c. 4 d. 5 How many different kinds of carbon atoms are there in the above compound? a. 3 b. 4 c. 5 d. 7Explanation / Answer
Answer 7: The mass spectra shows the presence of bromine. If the compound contains bromo in mass spectra we can see two peaks corresponding to M and M+2 with the ratio of 1:1. Because the isotope of Br 79 is Br 81 and the abundance is 98%. So we will get with the ratio of M and M+2 with 1:1 respectively. If compound contains chlorine we will get the two peaks M and M+2 with the ratio of 3:1. Because the isotope of Cl 35 is Cl37 and abundance is ~35%.
Answer 8: This mass spectrum says the presence of Iodine.
Answer 9: Whatever the MHz NMR spectrometer the PPM value wont change.
So the answer is 2.17 PPM.
Answer 10: In this compound all the protons are in different chemical environment. So it contains 5 kinds of protons.
Answer 11: In this compound all the carbons are in different chemical environment. So it contains 7 kinds of carbons.