Chapter 15 concepts

Question 1

Pauli exclusion

Answer 1

two electrons with opposite spin

Question 2

electron density

Answer 2

probability of finding an electron in a particular region of space

Question 3

Radio Wave

Answer 3

nuclear magnetic resonance spectroscopy

Question 4

Photon and Frequency

Answer 4

Directly proportional

Question 5

The presence of a chiral center

Answer 5

would prevent two protons from being interchangeable by reflection. the protons are diastereotopics

Question 6

What cant be analyzed by NMR spectrometer

Answer 6

Nucleus with even number of protons and even numbers of neutrons

Question 7

how many nuclear spin states for 1H?

Answer 7

2

Question 8

type of electromagnetic radiation in NMR

Answer 8

Radio wave

Question 9

shielded protons

Answer 9

experienced less net magnetic field strength smaller than the applied magnetic field

Question 10

energy gap between spin states for a H1 nucleus and the strength of the external magnetic field

Answer 10

directly proportional

Question 11

strength of the magnetic field determines

Answer 11

range of frequencies for NMR

Question 12

Common in H NMR

Answer 12

CDCl3, CCl4, CD2CN, D2O

Question 13

Uncommon in H NMR

Answer 13

CH3OH

Question 14

number of signals in a H NMR spectrum

Answer 14

Indicates the number of different kinds of protons

Question 15

Location of signals in a H NMR spectrum

Answer 15

indicates electronic environment of absorbing protons

Question 16

area under each signal in a H NMR

Answer 16

indicates the relative number of protons in the signal

Question 17

shape and multiplicty

Answer 17

indicates the number of neighboring protons

Question 18

Complex signal in NMR

Answer 18

free induction decay

Question 19

Free induction decay is converted into a spectrum via a methematical technique called a

Answer 19

fourier transformation

Question 20

The H NMR spectrum of bromoethane shows a signal at 3.5 ppm when the spectrum is recorded using a 60 MHz spectrometer, where do you expect to see the signal if a 300 MHz instrument is used instead?

Answer 20

3.5 ppm

Question 21

Tetramethlsilane

Answer 21

0

Question 22

aromatic protons signal 7-8

Answer 22

diamagnetic anisotropy

Question 23

CH split

Answer 23

doublet

Question 24

CH2 split

Answer 24

Triplet

Question 25

off resonance decoupling 13C NMR allows

Answer 25

13C-1H splitting

Question 26

broadband decoupling in 13C NMR surpresses

Answer 26

13H-1H splitting

Question 27

C NMR Carbonyl

Answer 27

160-200

Question 28

C NMR Aromatic

Answer 28

110-160

Question 29

C NMR Alkenes

Answer 29

90-135

Question 30

C NMR Alkynes

Answer 30

70-90

Question 31

C NMR Alkanes

Answer 31

5-80

Question 32

H NMR Carboxylic Acid

Answer 32

11-15

Question 33

H NMR Aldehyde

Answer 33

9-10

Question 34

H NMR Aromatic

Answer 34

6.5-8.5

Question 35

H NMR Alkenes

Answer 35

4.5-6.5

Question 36

H NMR Alkanes

Answer 36

0.5-4.5

Question 37

H NMR alkanes bonded to N, O, halogens

Answer 37

3-3.5