DAT Chapter 5 spectroscopy

Question 1

A big point peak at 1700 +/- 50 cm

Answer 1

C = O carbonyl

Question 2

A large, broad trough far to the left for alcohols and on top of 3000 or carboxylic acids

Answer 2

OH

Question 3

Big, pointy peaks coming straight down around 3000

Answer 3

C-Hs

Question 4

A sharp peak to the left of 3000 ( around 3200-3500)

Answer 4

N-H (one peak for -NH, two peaks for Nh2)

Question 5

medium sized peak at 2200

Answer 5

C triple N (nitrile)

Question 6

vampire teeth at 1500- 1600 and 1300 - 1400

Answer 6

NO2

Question 7

Ir spectroscopy is used to determine what

Answer 7

molecules functional group

Question 8

UV-Vis spectroscopy is used to analyze what

Answer 8

compounds with conjugated double bonds

Question 9

what is conjugated double bonds

Answer 9

one single bond next to double bond

Question 10

Mass spec is a technique that determines what

Answer 10

compounds mass

Question 11

Formula for degrees of unsaturation

Answer 11

2C+2+N-X-H/2

Question 12

Base peak is what

Answer 12

The tallest and most stable

Question 13

Ignore C-NMR if you dont have

Answer 13

C=O carbonyl

Question 14

What range on the C-NMR do these carbonyls show up ( esters, amide, carboxylic acids)

Answer 14

160-180 ppm

Question 15

What range on the C-NMR do these carbonyls show up (aldehydes and ketones

Answer 15

greater than 200

Question 16

H-NMR range of 12-14

Answer 16

carboxylic acid and amide Hs

Question 17

H-NMR range of 10

Answer 17

phenol and aldehydes Hs

Question 18

H-NMR range of 6-8

Answer 18

aromatic land, Hs stuck to benzene

Question 19

H-NMR range of 4-6

Answer 19

double bond land, Hs stuck to sp2 hybridized

Question 20

H-NMR range of 1-5

Answer 20

single bond land, Hs stuck to sp3 hybridized

Question 21

What does the integral number tell us in H NMR spec

Answer 21

how many hydrogens are in that peak

Question 22

Rule for splitting

Answer 22

count all the hydrogens next door in all directions and add one to it