PORTAGE LEARNING CHEM 219 PRINCIPLES OF ORGANIC CHEMISTRY – MODULES 1, 2, AND 3 COMPREHENSIVE 150-QUESTION PRACTICE EXAM WITH VERIFIED ANSWERS AND RATIONALES 2026/2027 UPDATE

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PORTAGE LEARNING CHEM 219 PRINCIPLES
OF ORGANIC CHEMISTRY – MODULES 1, 2, AND
3 COMPREHENSIVE 150-QUESTION PRACTICE
EXAM WITH VERIFIED ANSWERS AND
RATIONALES 2026/2027 UPDATE

PART 1: ATOMIC STRUCTURE AND BONDING


Question 1
What is the valence electron configuration for bromine and how many
bonds can it typically form?
A) 4s2 4p5; forms 1 bond
B) 4s2 4p6; forms 0 bonds
C) 4s2 4p3; forms 3 bonds
D) 4s2 4p4; forms 2 bonds


Verified Answer: A
Rationale: Bromine (Group 17) has 7 valence electrons, commonly
displayed as three lone pairs and one unpaired electron, allowing it to
typically form one bond. The valence electron configuration is 4s2 4p5 .


Question 2
Which element can form up to four bonds due to its valence electron
configuration?

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A) Sodium
B) Carbon
C) Oxygen
D) Selenium


Verified Answer: B
Rationale: Carbon (Group 14) has four valence electrons, displayed as
four unpaired electrons, allowing it to form four bonds. This is the basis
of carbons ability to form diverse organic molecules .


Question 3
How many bonds can sodium (Na) typically form?
A) 0 bonds
B) 1 bond
C) 2 bonds
D) 4 bonds


Verified Answer: B
Rationale: Sodium (Group 1) has one valence electron, which is
unpaired, so it generally forms one ionic bond .


Question 4
How many bonds can selenium (Se) typically form?
A) 0 bonds

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B) 1 bond
C) 2 bonds
D) 4 bonds


Verified Answer: C
Rationale: Selenium (Group 16) possesses 6 valence electrons,
commonly displayed as two lone pairs and two unpaired electrons,
allowing it to form two bonds .


Question 5
How many lone pairs does oxygen have in its valence shell?
A) 0
B) 1
C) 2
D) 3


Verified Answer: C
Rationale: Oxygen (Group 16) has 6 valence electrons, which are
displayed as two lone pairs and two unpaired electrons. The two lone
pairs allow oxygen to form two bonds .


Question 6
How many unpaired electrons does carbon have in its valence shell?
A) 1
B) 2

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C) 3
D) 4


Verified Answer: D
Rationale: Carbon (Group 14) has 4 valence electrons, all unpaired,
signifying the ability to form 4 bonds .


Question 7
How many bonds can silicon (Si) typically form?
A) 1
B) 2
C) 3
D) 4


Verified Answer: D
Rationale: Silicon (Group 14) has 4 valence electrons, all unpaired,
allowing it to form 4 bonds .


Question 8
How many lone pairs does bromine have in its valence shell?
A) 0
B) 1
C) 2
D) 3