Module 7 Exam: Organic Chemistry Intro, Hydrocarbons, and
Functional Groups 2026/2027 UPDATE
1. Which element is the primary focus of organic chemistry?
A. Nitrogen
B. Carbon
C. Oxygen
D. Silicon
Answer: B
Rationale: Organic chemistry is the study of carbon-based compounds.
2. How many valence electrons does a neutral carbon atom have?
A. 2
B. 6
C. 4
D. 8
Answer: C
Rationale: Carbon is in Group 14 and has 4 valence electrons, allowing it to form four
covalent bonds.
3. What is the general formula for a non-cyclic alkane?
A. CnH2n
B. CnH2n+2
C. CnH2n-2
D. CnHn
Answer: B
,Rationale: Alkanes are saturated hydrocarbons with the general formula CnH2n+2.
4. What is the molecular geometry of a carbon atom forming four single bonds?
A. Linear
B. Trigonal Planar
C. Octahedral
D. Tetrahedral
Answer: D
Rationale: Sp3 hybridized carbon atoms with four single bonds adopt a tetrahedral
geometry with 109.5 degree angles.
5. Which of the following describes a saturated hydrocarbon?
A. Contains a benzene ring
B. Contains at least one double bond
C. Contains at least one triple bond
D. Contains only single bonds
Answer: D
Rationale: Saturated hydrocarbons (alkanes) contain the maximum number of hydrogen
atoms possible, meaning only single C-C bonds.
6. What is the IUPAC name for a three-carbon alkane?
A. Methane
B. Propane
C. Ethane
D. Butane
Answer: B
Rationale: The prefix ‘prop-’ indicates three carbon atoms.
, 7. Compounds with the same molecular formula but different structural
arrangements are called:
A. Isomers
B. Allotropes
C. Isotopes
D. Polymers
Answer: A
Rationale: Structural isomers have the same formula but different connectivity.
8. What is the functional group found in an alcohol?
A. -OH
B. -COOH
C. -CHO
D. -NH2
Answer: A
Rationale: Alcohols are characterized by the hydroxyl (-OH) group.
9. Which of these is an unsaturated hydrocarbon?
A. Ethane
B. Propane
C. Cyclobutane
D. Ethene
Answer: D
Rationale: Ethene contains a double bond, making it unsaturated.
Functional Groups 2026/2027 UPDATE
1. Which element is the primary focus of organic chemistry?
A. Nitrogen
B. Carbon
C. Oxygen
D. Silicon
Answer: B
Rationale: Organic chemistry is the study of carbon-based compounds.
2. How many valence electrons does a neutral carbon atom have?
A. 2
B. 6
C. 4
D. 8
Answer: C
Rationale: Carbon is in Group 14 and has 4 valence electrons, allowing it to form four
covalent bonds.
3. What is the general formula for a non-cyclic alkane?
A. CnH2n
B. CnH2n+2
C. CnH2n-2
D. CnHn
Answer: B
,Rationale: Alkanes are saturated hydrocarbons with the general formula CnH2n+2.
4. What is the molecular geometry of a carbon atom forming four single bonds?
A. Linear
B. Trigonal Planar
C. Octahedral
D. Tetrahedral
Answer: D
Rationale: Sp3 hybridized carbon atoms with four single bonds adopt a tetrahedral
geometry with 109.5 degree angles.
5. Which of the following describes a saturated hydrocarbon?
A. Contains a benzene ring
B. Contains at least one double bond
C. Contains at least one triple bond
D. Contains only single bonds
Answer: D
Rationale: Saturated hydrocarbons (alkanes) contain the maximum number of hydrogen
atoms possible, meaning only single C-C bonds.
6. What is the IUPAC name for a three-carbon alkane?
A. Methane
B. Propane
C. Ethane
D. Butane
Answer: B
Rationale: The prefix ‘prop-’ indicates three carbon atoms.
, 7. Compounds with the same molecular formula but different structural
arrangements are called:
A. Isomers
B. Allotropes
C. Isotopes
D. Polymers
Answer: A
Rationale: Structural isomers have the same formula but different connectivity.
8. What is the functional group found in an alcohol?
A. -OH
B. -COOH
C. -CHO
D. -NH2
Answer: A
Rationale: Alcohols are characterized by the hydroxyl (-OH) group.
9. Which of these is an unsaturated hydrocarbon?
A. Ethane
B. Propane
C. Cyclobutane
D. Ethene
Answer: D
Rationale: Ethene contains a double bond, making it unsaturated.
