Chapter 10practiceQ

Chapter 10practiceQ - 1. In nuclear magnetic resonance,...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
1. In nuclear magnetic resonance, stronger magnetic fields A) give a higher sensitivity spectrum than do lower magnetic fields. B) give different chemical shifts (in ppm) than would weaker magnets. C) give better separation between peaks in the spectrum (in Hz) than would weaker magnets. D) give different coupling constants than would be observed with weaker magnetic fields. E) Both A and C are true. Ans: 2. Which of the following structures of formula C 8 H 8 Br 2 would give the NMR spectrum shown below? A) CH CH 2 Br Br B) Br CH CH 3 Br C) Br CH 2 CHBr 2 D) Br CH CH 3 Br E) Page 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Br CH 2 CH 2 Br Ans: 3. The type of electromagnetic energy required to cause nuclear magnetic resonance is A) infrared B) radio C) ultraviolet D) visible E) microwave Ans: 4. Which of the following structures C 5 H 12 O would give the NMR spectrum shown? A) H 3 C CH 2 CH 2 CH 2 CH 2 OH B) H 3 C CH 2 CH CH 2 CH 3 OH C) H 3 C CH 2 CH 2 CH CH 3 OH D) CH 3 CH 3 CH CH CH 3 OH E) CH 3 CH 3 CH CH 2 CH 2 OH Ans: 5. Which of the following is not true of 13 C NMR? A) The sensitivity of 13 C NMR is much less than that of proton NMR. B) By simultaneously decoupling the proton region, 13 C peaks appear as singlets. C) 13 C chemical shifts cover a much larger range than do 1 H chemical shifts. Page 2
Background image of page 2
D) The 13 C NMR spectrum can show more peaks than there are carbons in the molecular formula. E) The 13 C NMR spectrum will show one peak for each type of carbon in a molecule. Ans: 6. How many different types of hydrogens are present in the following molecule? H 3 C CH CH CH Br Br CH 3 Br A) three B) four C) five D) six E) seven Ans: 7. The CH 2 group indicated would most likely appear as what in the proton NMR spectrum? A) singlet B) doublet C) triplet D) quartet E) pentet Ans: 8. How many different types of carbon would be present in the following molecule? CH 3 CH 3 A) three B) four C) five D) six E) eight Ans 10. The most downfield proton NMR signal (i.e., signal most to the left in the spectrum) in the following molecule would be H 3 C C CH 2 C CH 3 Br Br CH 3 Br D C B A A) A B) B C) C D) D E) there is no way to tell Ans: C Page 3
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
11. A very old bottle labeled only “chlorinated benzene” was found in the stockroom. Capillary GC showed (surprisingly) that the compound was pure, and a proton-
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/07/2012 for the course ECON 122 taught by Professor Staff during the Spring '11 term at Rutgers.

Page1 / 18

Chapter 10practiceQ - 1. In nuclear magnetic resonance,...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online