Chapter 5 - Spectroscopy Flashcards Preview

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Flashcards in Chapter 5 - Spectroscopy Deck (14)
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1
Q

An IR graph that shows a peak of 1700 indicates a compound with what functional group?

A

carbonyl

2
Q

An IR graph that shows a large, broad trough to the left of 3000 indicates a compound with what functional group?

A

OH

3
Q

What will the IR graph look like for a compound with a COOH?

A

a widened and shorter peak on top of the OH trough around 3000

4
Q

If an IR graph shows “vampire teeth” around 1500-1600 or from 1300-1400, this indicates a ____ group

A

NO2

5
Q

A sharp peak to the left of 3000 will indicate a ____ group

A

NH

1 peak for NH, 2 peaks for NH2

6
Q

a medium sized peak around 2200 will indicate a ______ group

A

nitrile

7
Q

What is UV vis used for?

A

analyze compounds with conjugated double bonds

8
Q

Degrees of Unsaturation Formula

A

Degrees of unsaturation = 2C + 2 + N - H - X
_______________
2

9
Q

When determining degrees of unsaturation, triple bonds will count as ____ degree, and ring will count as ___ degree

A

2, 1

10
Q

Where would alkanes, alkenes, and aromatics show up in NMR spectroscopy?

*types of carbons

A

alkanes - 0 to 70

alkenes - 90 to 120

aromatics - 110 to 160

11
Q

Where would carbonyls, aldehydes, and ketones show up in NMR spectroscopy?

A

carbonyls - 160 to 180

aldehydes and ketones - greater than 200

12
Q

H’s stuck to sp3 hybridized atoms (such as in CH3, CH2, CH groups) will be found where on H-NMR?

Where would H’s in a C=C double bond be found?

H’s on an aromatic ring?

A

H’s in sp3 hybridized atoms = 1 to 5 ppm

H’s in C=C double bond = 4 to 6 ppm

Aromatic H’s = 6 to 8 ppm

13
Q

Where would the following hydrogens be found on H-NMR?

Aldehyde
Carboxylic acid
Phenol
Amide

A

aldehyde and and phenol H’s = approximately 10 ppm

COOH = 12 to 14 ppm

Amide = 11 to 13

14
Q

Where would the following hydrogens be found on H-NMR?

Alcoholic OH’s
Amine

A

0.5 to 5.5 ppm