V1 j2 2868 cm 1 25 to which branch do these

v=1, J=2) 2868 cm
25. To which branch do these transitions belong? P Q or
26. Determine the rotational constant (B) for D-F in wavenumbers.
27. Calculate the moment of inertia (I) for D-F in units of kg m
2
.
28. Calculate the bond length for D-F.
Phosphine (PH
3
) is a pyramidal molecule much like ammonia. It has fundamental vibrations at the
following frequencies:
29. How many vibrations would you expect for phosphine (PH
3
)?
30. Would any bands be expected to be IR inactive?
A mixture PH
3
and PD
3
showed the following vibrational bands.
2421, 2327, 1698, 1694, 1121, 990, 806, 730 cm
31. Of these, which one would you expect to be to be the asymmetric stretch of PH
3
?
32. Which one would you expect to be to be the asymmetric stretch of PD
3
?
-1
R
-1

Chemistry 213 Midterm 1 – Sample A Feb 2014
Structures – 8 marks each
The compound C
7
H
7
OCl gives the IR spectrum shown below.
3300 1011 829 cm
How many DBE’s (double bond equivalents) are in this molecule?
-1
h) 7
6
Draw the best option for this molecule ,
including all atoms and relevant geometry.
What is the principle functional group in this compound?
What type of vibration is responsible for the peak at 1011 cm
-1
?

Chemistry 213 Midterm 1 – Sample A Feb 2014
The compound C
9
H
11
NO gives the IR spectrum shown below.
3300 1680 720 695 cm
How many DBE’s (double bond equivalents) are in this molecule?
-1
a) 0 b) 1 c) 2 d) 3 e) 4 f) 5 g) 6 h) 7
7
Draw the TWO possible structures for this molecule ,
including all atoms and relevant geometry.
What is the principle functional group in this compound?
What type of vibration is responsible for the peak at 3300 cm
-1
?

Chemistry 213 Midterm 1 – Sample A Feb 2014
The compound C
6
H
10
O
2
gives the IR spectrum shown below
and contains two functional groups.
1712 969 cm
-1
How many DBE’s (double bond equivalents) are in this molecule?
h) 7
8
Draw TWO possible structures for this molecule ,
including all atoms and relevant geometry.
What type of vibration is responsible for the peak at 969 cm
-1
?
a) C=O str b) C-C str c) C-H str d) -C-H bend e) =C-H bend
f) C-O str g) =C-H str h) C=C str i) C ≡ C str j) O-H str
What type of vibration is responsible for the broad peak 3500-2500 cm
-1
?