Borough of Manhattan Community College
KE ™
Department of Science CHE 240 Second Hour Exam, Spring 2025
Name N Instructor: Dr. B. Dewprashad
1-Part 1. For each of the three IR spectra shown below: (15
Points)
A. Calculate the degree(s) of unsaturation, B. What are the functio
nal groups indicated? Match the peaks to
each of the corresponding functional group. You need to indicat
e (with arrow) where the peak is and which
group it corresponds to, and C. Propose a reasonable structure
(a) C4HgO
100
b u
N
oo \
;
[
O
C 50~
~
Rl
C\-\ — £
(Vg™
o Gy
™2
)
[= g{,
(W
" A
' ' ,"r\ 20110 15'00 ) ) m:)o ) so'o
wavenurnber cm!
|
(b) C¢Hiz O _
100
% P D
o
c S0
)
% _ L __C\_k
% 2) 2876 y [Hé-CH’C § ey “
£ ol
. o Vi
“
e vy "
{ liquid film sat 1194 (D L W\.i 2\
\
sample siex
© r— ce v — — 1737
T -
4000 3000 2000
L i > L ¥ il a M
1500 1000 500
wavenurnber cm!
KE ™
Department of Science CHE 240 Second Hour Exam, Spring 2025
Name N Instructor: Dr. B. Dewprashad
1-Part 1. For each of the three IR spectra shown below: (15
Points)
A. Calculate the degree(s) of unsaturation, B. What are the functio
nal groups indicated? Match the peaks to
each of the corresponding functional group. You need to indicat
e (with arrow) where the peak is and which
group it corresponds to, and C. Propose a reasonable structure
(a) C4HgO
100
b u
N
oo \
;
[
O
C 50~
~
Rl
C\-\ — £
(Vg™
o Gy
™2
)
[= g{,
(W
" A
' ' ,"r\ 20110 15'00 ) ) m:)o ) so'o
wavenurnber cm!
|
(b) C¢Hiz O _
100
% P D
o
c S0
)
% _ L __C\_k
% 2) 2876 y [Hé-CH’C § ey “
£ ol
. o Vi
“
e vy "
{ liquid film sat 1194 (D L W\.i 2\
\
sample siex
© r— ce v — — 1737
T -
4000 3000 2000
L i > L ¥ il a M
1500 1000 500
wavenurnber cm!
