Spectroscopy

Question 1

alkane absorption peak

Answer 1

2800-3000
1200

Question 2

alkene absorption peak

Answer 2

3080-3140
1645

Question 3

alkyne absorption peak

Answer 3

3300
2200

Question 4

aromatic absorption peak

Answer 4

2900-3100
1475-1625

Question 5

alcohol absorption peak

Answer 5

3100-3500 broad

Question 6

ether absorption peak

Answer 6

1050-1150

Question 7

aldehyde absorption peak

Answer 7

2700-2900
1700-1750
fangs

Question 8

ketone absorption peak

Answer 8

1700-1750

Question 9

CA absorption peak

Answer 9

1700-1750
2800-3200 (broad)

Question 10

amines absorption peak

Answer 10

3100-3500 (sharp)

Question 11

How to read HNMR

Answer 11

the further down the more deshielded the proton meaning the more contact it has to EWGs

the # of peaks -1 is how many adjacent Hs the protons represented under a particular peak are near

the area ratios represent the ratio of hydrogens under each peak relative to each other

position on the spectrum can also indicate TYPE of proton

Question 12

HNMR alkyl group range

Answer 12

0-3 ppm

Question 13

HNMR alkyne group range

Answer 13

2-3 ppm

Question 14

HNMR alkene group range

Answer 14

4.6-6 ppm

Question 15

HNMR aromatic group range

Answer 15

6-8.5 ppm

Question 16

HNMR aldehyde group range

Answer 16

9-10 ppm

Question 17

HNMR CA group range

Answer 17

10.5-12 ppm

Question 18

What is NMR dependent on to detect, record, and display magnetic moments?

Answer 18

α-states (lower energy nuclei w magnetic moments that are aligned w the field) and β-states (higher energy)

nearby atoms w nuclei magnetic field can affect each other’s magnetic moments

Question 19

how does MRI work?

Answer 19

cross sectional scan

proton absorption density measured and represented through depth of color

dark is water
light is fat