Organic Chemistry

Front 1

Why use IR instead of NMR?

Back 1

If you want to know which functional groups are present in a molecule, use IR. If you want to know how many H's are present and where they are in a molecule, use NMR.

Front 2

1) The vibration must result in a _________ to show up in the IR spec

Back 2

1) change in bond dipole moment

Front 3

1) What is measured in IR spec?
2) Eqn for wavelength & frequency
3) What is transmittance look like on a IR spec?

Back 3

1) How much a bond stretches/compresses - Vibration
2) Speed = Frequency * Wavelength
3) Transmittance is on the y axis - it shows how much light was absorbed at each frequency

Front 4

IR spec - Where are they located:
1) Ketones
2) Amines
3) Alcohols
4) Aldehydes

Back 4

1) 1700-1750
2) 3100-3500 (sharp)
3) 3100-3500 (broad)
4) 2700-2900 (O)C-H

Front 5

IR spec - Where are they located:
1) Alkanes
2) Alkenes
3) Alkynes
4) Carbonyl

Back 5

1) 1200 (C-C)
2) 1645 (C=C)
3) 2200 (C≡C)
4) 1700

Front 6

1) Anything around 3000cm-1 involves a ________
2) Anything around 2000 cm-1 and below does not involve ____________
3) What is bond order?
4) The higher the bond order, the faster it __(a)__, and so the ((b) lower or higher) the wavenumber.

Back 6

1) hydrogen atom, be it O-H, N-H, or C-H
2) hydrogen, be it C=O, C=C, C-C, or C-O
3) Number of bonds b/t a pair of atoms
4) (a) vibrates (b) higher

Front 7

1) Broad IR peaks are due to _____.
2) Below 1300 in IR is called the _________.
3) Primary and Complementary colors?

Back 7

1) H bonding
2) Fingerprint Region

Front 8

1) Describe an indicator
H-indicator <--> H+ + Indicator-
2) At low pH, ________ and it's color will predominate
3) At high pH, ________ and it's color will predominate

Back 8

1) Molecules that can change structure and varying pH's causing more/less absorption
2) H-indicator
3) Indicator-

Front 9

1) What are the colors of the universal indicator? Mention the acidity level of each
2)

Back 9

1) (ROY-G-BIV) R:very acidic, O:acidic, Y:weakly acidic, G:neutral, B:basic, V:very basic