IR

Question 1

what is the peak for a hydrogen attached to a sp hybridized carbon (alkyne)

Answer 1

3300

Question 2

what is the peak for a hydrogen bonded to an sp2 hybridized carbon

Answer 2

3100

Question 3

what is the peak for a hydrogen bonded to an sp3 hybridized carbon

Answer 3

2900

Question 4

if you increase the mass between two atoms on a covalent bond, will it vibrate faster or slower

Answer 4

faster

Question 5

if you have a stronger bond, what happens to the frequency on IR

Answer 5

it is faster

Question 6

why do sp hydrogens appear with more frequency than sp3

Answer 6

the bonds are shorter and held more closely to the nucleus so they vibrate more

Question 7

where does a C-H bond appear

Answer 7

3032 cm

Question 8

where does a C-O appear

Answer 8

1109 cm

Question 9

where does a C=C appear

Answer 9

1682 cm-1

Question 10

where does O-H appear

Answer 10

3500

Question 11

what affects the intensity of a signal

Answer 11

the dipole moment, if there is a EN difference between the two bottom atoms, we see a strong signal

Question 12

what indicates an OH group?

Answer 12

a broad signal

Question 13

what indicates a carboxlyic acid

Answer 13

a slightly different braod signal

Question 14

what type of signal do we see with a primary amine

Answer 14

2 signals, one for asymetric and one for symmetric

Question 15

what does resonance do to the signal on a carbonyl

Answer 15

it lowers it

Question 16

what do electronegative atoms do to a carbonyl

Answer 16

due to the inductive effect, electron density from the oxygen is pulled into the bond and to the electronegative group, this causes a higher signal to be observed

Question 17

how many signals with acid anhydride

Answer 17

2, asymmetric and symmetric

Question 18

when looking for C-H, N-H, or OH bonds, look to the left of 3000

Question 19

where does a carbonyl appear

Answer 19

1700

Question 20

where does aromatic appear

Answer 20

3030