CHEM 219 Principles of Organic Chemistry –
Modules 1-8 Exam & Final Exam (Latest 2025)
Portage Learning
,1. What is organic chemistry?
A) The study of all carbon-containing compounds
B) The study of compounds containing only hydrogen
C) The study of inorganic compounds
D) The study of metals
*A) The study of all carbon-containing compounds *
Rationale: Organic chemistry is the branch of chemistry that studies the structure,
properties, composition, reactions, and synthesis of organic compounds, which are
compounds containing carbon. Carbon's ability to form stable bonds with itself and other
elements creates an enormous diversity of organic molecules .
2. What is the valence of carbon in most organic compounds?
A) 2
B) 3
C) 4
D) 6
*C) 4 *
Rationale: Carbon has four valence electrons and typically forms four covalent bonds to
achieve a stable octet. This tetravalency is the basis for the vast diversity of organic
compounds .
3. Which of the following elements is NOT commonly found in organic
compounds?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Sodium
*D) Sodium *
,Rationale: Organic compounds are primarily composed of carbon and hydrogen, often
with oxygen, nitrogen, sulfur, phosphorus, and halogens. Sodium is a metal typically found
in inorganic compounds, though it can form organic salts (organometallic compounds) .
4. What is catenation?
A) The ability of an element to form bonds with itself
B) The ability of an element to form ionic bonds
C) The ability of an element to gain electrons
D) The ability of an element to lose electrons
*A) The ability of an element to form bonds with itself *
Rationale: Catenation is carbon's unique ability to form long chains, branched structures,
and rings through carbon-carbon bonds. This property creates the structural diversity
essential for the millions of organic compounds known .
5. Why is carbon able to form so many different compounds?
A) It has only two valence electrons
B) It can form stable covalent bonds with itself and many other elements
C) It cannot form double bonds
D) It is a metal
*B) It can form stable covalent bonds with itself and many other elements *
Rationale: Carbon can form stable covalent bonds with other carbon atoms and with
many other elements (H, O, N, S, halogens). The diversity of bonding patterns (single,
double, triple) and chain structures leads to millions of possible compounds .
6. What type of bond is formed by the end-to-end overlap of atomic orbitals?
A) Pi (π) bond
B) Sigma (σ) bond
, C) Hydrogen bond
D) Ionic bond
*B) Sigma (σ) bond *
Rationale: Sigma bonds result from head-on (end-to-end) overlap of atomic orbitals along
the internuclear axis. All single bonds contain one sigma bond, and sigma bonds are
always the first bond formed between two atoms .
7. What type of bond is formed by the sideways overlap of p orbitals?
A) Sigma (σ) bond
B) Pi (π) bond
C) Ionic bond
D) Coordinate covalent bond
*B) Pi (π) bond *
Rationale: Pi bonds result from sideways overlap of parallel p orbitals above and below the
bond axis. A double bond consists of one sigma and one pi bond; a triple bond consists of
one sigma and two pi bonds .
8. How many sigma bonds are present in a C=C double bond?
A) 0
B) 1
C) 2
D) 3
*B) 1 *
Rationale: A C=C double bond consists of one sigma (σ) bond formed by end-to-end
overlap and one pi (π) bond formed by sideways overlap of p orbitals .
Modules 1-8 Exam & Final Exam (Latest 2025)
Portage Learning
,1. What is organic chemistry?
A) The study of all carbon-containing compounds
B) The study of compounds containing only hydrogen
C) The study of inorganic compounds
D) The study of metals
*A) The study of all carbon-containing compounds *
Rationale: Organic chemistry is the branch of chemistry that studies the structure,
properties, composition, reactions, and synthesis of organic compounds, which are
compounds containing carbon. Carbon's ability to form stable bonds with itself and other
elements creates an enormous diversity of organic molecules .
2. What is the valence of carbon in most organic compounds?
A) 2
B) 3
C) 4
D) 6
*C) 4 *
Rationale: Carbon has four valence electrons and typically forms four covalent bonds to
achieve a stable octet. This tetravalency is the basis for the vast diversity of organic
compounds .
3. Which of the following elements is NOT commonly found in organic
compounds?
A) Carbon
B) Hydrogen
C) Nitrogen
D) Sodium
*D) Sodium *
,Rationale: Organic compounds are primarily composed of carbon and hydrogen, often
with oxygen, nitrogen, sulfur, phosphorus, and halogens. Sodium is a metal typically found
in inorganic compounds, though it can form organic salts (organometallic compounds) .
4. What is catenation?
A) The ability of an element to form bonds with itself
B) The ability of an element to form ionic bonds
C) The ability of an element to gain electrons
D) The ability of an element to lose electrons
*A) The ability of an element to form bonds with itself *
Rationale: Catenation is carbon's unique ability to form long chains, branched structures,
and rings through carbon-carbon bonds. This property creates the structural diversity
essential for the millions of organic compounds known .
5. Why is carbon able to form so many different compounds?
A) It has only two valence electrons
B) It can form stable covalent bonds with itself and many other elements
C) It cannot form double bonds
D) It is a metal
*B) It can form stable covalent bonds with itself and many other elements *
Rationale: Carbon can form stable covalent bonds with other carbon atoms and with
many other elements (H, O, N, S, halogens). The diversity of bonding patterns (single,
double, triple) and chain structures leads to millions of possible compounds .
6. What type of bond is formed by the end-to-end overlap of atomic orbitals?
A) Pi (π) bond
B) Sigma (σ) bond
, C) Hydrogen bond
D) Ionic bond
*B) Sigma (σ) bond *
Rationale: Sigma bonds result from head-on (end-to-end) overlap of atomic orbitals along
the internuclear axis. All single bonds contain one sigma bond, and sigma bonds are
always the first bond formed between two atoms .
7. What type of bond is formed by the sideways overlap of p orbitals?
A) Sigma (σ) bond
B) Pi (π) bond
C) Ionic bond
D) Coordinate covalent bond
*B) Pi (π) bond *
Rationale: Pi bonds result from sideways overlap of parallel p orbitals above and below the
bond axis. A double bond consists of one sigma and one pi bond; a triple bond consists of
one sigma and two pi bonds .
8. How many sigma bonds are present in a C=C double bond?
A) 0
B) 1
C) 2
D) 3
*B) 1 *
Rationale: A C=C double bond consists of one sigma (σ) bond formed by end-to-end
overlap and one pi (π) bond formed by sideways overlap of p orbitals .
