Spectroscopy

Question 1

wavenumber for C=O

Answer 1

1650-1750cm-1

Question 2

cm-1 for nitrile

Answer 2

2200cm-1

Question 3

cm-1 for N-H

Answer 3

3200-3500 one sharp peak

Question 4

NH2 cm-1

Answer 4

3200-3500 two sharp peaks

Question 5

C-H cm-1

Answer 5

big pointy peaks around 3000cm-1

Question 6

NO2 cm-1

Answer 6

vampire teeth peaks at 1300-1400 and 1500-1600

Question 7

OH cm-1

Answer 7

3200-3300 broad peak

Question 8

COOH cm-1

Answer 8

on top of 3000cm-1

Question 9

Purpose of IR spectroscopy

Answer 9

identify functional groups (NOTE: if O or N is present)

Question 10

CNMR for aldehydes and ketons

Answer 10

> 200 ppm

Question 11

CNMR for esters, cacid, and amides

Answer 11

160-180ppm

Question 12

TMS

Answer 12

0ppm

Question 13

HNMR for benzylic

Answer 13

6-8 ppm

Question 14

HNMR for aldehyde and phenol

Answer 14

10 ppm

Question 15

HNMR c-acid and amide H’s

Answer 15

12-14

Question 16

HNMR for double bond land - sp2

Answer 16

4-6

Question 17

HNMR alcohol and amine H

Answer 17

0.5-5.5

Question 18

HNMR single bond sp3

Answer 18

1-5

Question 19

When consider CNMR?

Answer 19

when compound has C=O in it

Question 20

What to focus on for HNMR

Answer 20

• integral numbers
• peak locations
• splitting

Question 21

What is UV-VIS spectro used for?

Answer 21

analyze compound with conjug bonds

Question 22

What is mass spectrometry for?

Answer 22

determine compounds mass/fragmentation/formula

Question 23

Equation for degrees of unsaturation

Answer 23

C - (H/2) - (N/2) - (X/2) + 1