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Organic Chemistry Lab > Spectroscopy > Flashcards

Spectroscopy Flashcards

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1
Q

Higher energy means (higher/lower)frequency and (longer/shorter) wavelength.

A

Higher frequency, shorter wavelength

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2
Q

Lower energy means (higher/lower) frequency and (longer/shorter) wavelength.

A

Lower frequency, longer wavelength

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3
Q

What is the wavelength range of the IR region of the electromagnetic spectrum?

A

2.5-25 micrometers

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4
Q

Wavenumbers are proportional to…

A

Frequency and energy

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5
Q

Frequency (increases/decreases) with increasing atomic mass

A

Decreases

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6
Q

Frequency (increases/decreases) with bond energy

A

Increases

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7
Q

(Polar/Nonpolar) bonds are usually IR-active

A

Polar

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8
Q

Bonds with more s character absorb at a (higher/lower) frequency

A

Higher

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9
Q

Secondary amine signal is…

A

Broad with 1 sharp spike

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10
Q

Primary amine signal is…

A

Broad with 2 sharp spikes (think 1 per hydrogen)

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11
Q

Tertiary amine signal is…

A

No signal for tertiary amine

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12
Q

Aldehydes have two C-H signals around…

A

2700-2800 cm-1

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13
Q

In NMR, the number of signals shows…

A

How many different kinds of protons are present

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14
Q

In NMR, the location of the signals shows…

A

How shielded or deshielded the proton is

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15
Q

In NMR, the intensity of the signal shows…

A

The number of protons of that type

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16
Q

In NMR, signal splitting shows…

A

The number of protons on adjacent carbon atoms

17
Q

What compound is the internal standard for NMR with a signal of 0 ppm?

A

TMS (tetramethylsilane)

18
Q

Aldehydes show up on NMR at…

A

9.5-10.5

19
Q

Aromatic hydrogens show up at…

A

6.5-8.5

20
Q

Carboxylic acid protons show up at…

A

10+

21
Q

Phenol shows up at…

A

4-7

22
Q

Esters show up at…

A

3.5-4.5

23
Q

Ethers show up at…

A

3-4

24
Q

Ethyl groups have a splitting pattern of….

A

Quartet/triplet

25
Q

Isopropyl groups have a splitting pattern of…

A

Septet/doublet

26
Q

Degrees of unsaturation formula

A

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

Organic Chemistry Lab (2 decks)

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