Portage Learning Chem 219 – Module 2 Exam Principles of Organic Chemistry | Questions and Answers [Verified Answers] Plus Rationales | Latest 2026/27

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Portage Learning Chem 219 – Module 2 Exam
Principles of Organic Chemistry | Questions and
Answers [Verified Answers] Plus Rationales | Latest
2026/27



ALKANES & NOMENCLATURE

1.
What is the general formula for alkanes?
A. CₙH₂ₙ
B. CₙH₂ₙ₋₂
C. CₙH₂ₙ₊₂
D. CₙHₙ
Answer: C
Rationale: Alkanes are saturated hydrocarbons with only
single bonds.
2.
What is the correct name for CH₃–CH₂–CH₃?
A. Ethane
B. Propane
C. Butane
D. Methane
Answer: B
Rationale: Three carbons → prefix “prop-”.
3.

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What is the longest chain rule used for?
A. Counting hydrogens
B. Determining parent name
C. Finding functional groups
D. Counting bonds
Answer: B
Rationale: The longest carbon chain defines the base
name.
4.
A methyl group is:
A. CH₂
B. CH₃ substituent
C. CH₄
D. C₂H₅
Answer: B
5.
What is the name of a 4-carbon alkane?
A. Propane
B. Butane
C. Pentane
D. Hexane
Answer: B
ALKENES & ALKYNES

6.

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General formula for alkenes:
A. CₙH₂ₙ₊₂
B. CₙH₂ₙ
C. CₙH₂ₙ₋₂
D. CₙHₙ
Answer: B
Rationale: One double bond reduces hydrogen count.
7.
Suffix for alkenes:
A. -ane
B. -ene
C. -yne
D. -ol
Answer: B
8.
General formula for alkynes:
A. CₙH₂ₙ
B. CₙH₂ₙ₊₂
C. CₙH₂ₙ₋₂
D. CₙHₙ
Answer: C
9.
Suffix for alkynes: