Answer ke
(Tes+ 1)
Midterm Exam II
CHEM 2100
March 4, 2026
Please carefully read these instructions
* Please fill out your last name, first name, and student number on the student answer sheet.
e There is a total of 22 questions. You need to answer any 20 to get full credit, and
answering all of them gives you extra credit.
* You can write on the question set; however, it will not be graded.
* Calculators and cell phones are not allowed.
* The periodic table and pka table have been included at the end of the question set.
* There is ZERO TOLERANCE FOR CHEATING.
Question type: Multiple Choice
1. Identify the conjugate acid of CH;CH2NHo.
o ® <) o ®
CHyCH3NH, CHaCHoNHs CHsCHoNHy (CHoCHoNH, CH,CH,NH,
| Il 11 IV Vv
Al
B0
D)1V
B)V
2. Which of the following is/are a tertiary amine?
+NH2 /‘\N—o )\N— /\N/\
1 |
l H H
| I i v
A)Iand II
C) I and TII
D) lll and IV
E)I
, 3. For the following reaction identify the acid, base, conjugate acid and conjugate base.
® O o ®
CHsCH,SH + Na OH ——» CHsCH,S Na + H,0
| I I WY
A) I = base; II = acid; III = conjugate base; IV = conjugate acid
I = acid; II = base; III = conjugate base; IV = conjugate acid
) I = base; II = acid; III = conjugate acid; IV = conjugate base
D) I = acid; II = base; III = conjugate acid; IV = conjugate base
E) I = base; II = base; III = conjugate acid; IV = conjugate acid
4. Which of the following is 3-ethyl-3-methylpentane?
| Il 11l \Y% \
Al
B)1I
C)III
v
BE)V
5. Which of the following lists the correct functional groups found in aspartame, the
artificial sweetener?
[e] “ NH, O
\O NOH
o
aspartame
A) Amine, aromatic, carboxylic acid, ether, ketone
@ Amine, amide, aromatic, carboxylic acid, ester
C) Amide, alcohol, aromatic, carboxylic acid, ether
D) Amine, aromatic, carboxylic acid, ester, nitrile
E) Amine, aromatic, aldehyde, ester, nitrile
, 6. For the following acid-base reaction, identify the correct curved arrow mechanism.
/\8J\+Na ® e OH —» 0 )\ + H0 + Na ®
|
H
CRE)
Il /\((g + Na _OH
H
.
® ©
M /\(g + Na _OH
AT
B)II
(©yn1
D)1V
E)V
, 7. Which of the following best explains which proton is more acidic?
H—S@—O—H
| I
A) The H (I) attached to S is more acidic due to oxygen being more electronegative.
B) The H (II) attached to O is more acidic due to sulfur being more electronegative.
C) The H (I) attached to S is more acidic due to sulfur being more electronegative.
D) The H (II) attached to O is more acidic due to oxygen being more electronegative.
éThe H (I) attached to S is more acidic due to the sulfur being larger than oxygen.
8. Which of the following are anti conformers? -
H CH, H H
H H H H H. H H CH,
H CH, H H HyC H HC H
CH, CHy CH,
| 1 n v
A)Tand II
B) II and I1I
C)Tand IV
@II and IV
9. What is the common name of the following alkyl group?
@ Isopropyl
B) Isobutyl
C) sec-Butyl
D) fert-Butyl
(Tes+ 1)
Midterm Exam II
CHEM 2100
March 4, 2026
Please carefully read these instructions
* Please fill out your last name, first name, and student number on the student answer sheet.
e There is a total of 22 questions. You need to answer any 20 to get full credit, and
answering all of them gives you extra credit.
* You can write on the question set; however, it will not be graded.
* Calculators and cell phones are not allowed.
* The periodic table and pka table have been included at the end of the question set.
* There is ZERO TOLERANCE FOR CHEATING.
Question type: Multiple Choice
1. Identify the conjugate acid of CH;CH2NHo.
o ® <) o ®
CHyCH3NH, CHaCHoNHs CHsCHoNHy (CHoCHoNH, CH,CH,NH,
| Il 11 IV Vv
Al
B0
D)1V
B)V
2. Which of the following is/are a tertiary amine?
+NH2 /‘\N—o )\N— /\N/\
1 |
l H H
| I i v
A)Iand II
C) I and TII
D) lll and IV
E)I
, 3. For the following reaction identify the acid, base, conjugate acid and conjugate base.
® O o ®
CHsCH,SH + Na OH ——» CHsCH,S Na + H,0
| I I WY
A) I = base; II = acid; III = conjugate base; IV = conjugate acid
I = acid; II = base; III = conjugate base; IV = conjugate acid
) I = base; II = acid; III = conjugate acid; IV = conjugate base
D) I = acid; II = base; III = conjugate acid; IV = conjugate base
E) I = base; II = base; III = conjugate acid; IV = conjugate acid
4. Which of the following is 3-ethyl-3-methylpentane?
| Il 11l \Y% \
Al
B)1I
C)III
v
BE)V
5. Which of the following lists the correct functional groups found in aspartame, the
artificial sweetener?
[e] “ NH, O
\O NOH
o
aspartame
A) Amine, aromatic, carboxylic acid, ether, ketone
@ Amine, amide, aromatic, carboxylic acid, ester
C) Amide, alcohol, aromatic, carboxylic acid, ether
D) Amine, aromatic, carboxylic acid, ester, nitrile
E) Amine, aromatic, aldehyde, ester, nitrile
, 6. For the following acid-base reaction, identify the correct curved arrow mechanism.
/\8J\+Na ® e OH —» 0 )\ + H0 + Na ®
|
H
CRE)
Il /\((g + Na _OH
H
.
® ©
M /\(g + Na _OH
AT
B)II
(©yn1
D)1V
E)V
, 7. Which of the following best explains which proton is more acidic?
H—S@—O—H
| I
A) The H (I) attached to S is more acidic due to oxygen being more electronegative.
B) The H (II) attached to O is more acidic due to sulfur being more electronegative.
C) The H (I) attached to S is more acidic due to sulfur being more electronegative.
D) The H (II) attached to O is more acidic due to oxygen being more electronegative.
éThe H (I) attached to S is more acidic due to the sulfur being larger than oxygen.
8. Which of the following are anti conformers? -
H CH, H H
H H H H H. H H CH,
H CH, H H HyC H HC H
CH, CHy CH,
| 1 n v
A)Tand II
B) II and I1I
C)Tand IV
@II and IV
9. What is the common name of the following alkyl group?
@ Isopropyl
B) Isobutyl
C) sec-Butyl
D) fert-Butyl
