1|Page
CHEM 219: VERSION 2 UPDATED
2026/ 2027 ACTUAL EXAM
PREPARATION WITH COMPLETE
QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES |
ALREADY GRADED A+||BRAND
NEW VERSION!!
What are hydrocarbons?
----Solution----
Molecules composed of only the elements carbon and hydrogen
What are the two major classes of hydrocarbons?
----Solution----
Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons?
----Solution----
Fossil fuels like coal, petroleum, and natural gas obtained by mining and
drilling.
What are Alkanes?
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----Solution----
They are saturated hydrocarbons because their skeleton is only
composed of C-C single bonds.
How can alkanes exist?
----Solution----
They can be linear, branched or exist in ring formations called
cycloalkanes.
Describe a higher/more complex alkane structure:
----Solution----
They will have more carbons and/or increased structural diversity.
What is the general formula of Alkanes?
----Solution----
CnH2n+2
The names of the alkanes reflect?
----Solution----
The number of carbons present.
How many isomers does each alkane have from 1-10
----Solution----
1,1,1,2,3,5,9,18,35,75
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Name the first ten prefix of alkanes:
----Solution----
Methane, ethane, propane, butane, pentane, hexane, heptane, octane,
nonane, decane.
As the molecular weight increases:
----Solution----
The number of isomers increase.
What does the suffix -ane mean?
----Solution----
Denotes a saturated hydrocarbon. It is used for all acyclic saturated
alkanes
What is nomenclature?
----Solution----
The naming of a molecular structure. Historically they were named after
their source, now they are systemic.
Why is nomenclature important?
----Solution----
Because we cannot remember all the prefixes since a MF composed of
carbons can have several different patterns of connectivity.
CHEM 219: VERSION 2 UPDATED
2026/ 2027 ACTUAL EXAM
PREPARATION WITH COMPLETE
QUESTIONS AND CORRECT
ANSWERS WITH RATIONALES |
ALREADY GRADED A+||BRAND
NEW VERSION!!
What are hydrocarbons?
----Solution----
Molecules composed of only the elements carbon and hydrogen
What are the two major classes of hydrocarbons?
----Solution----
Aromatic (benzene) and aliphatic (alkanes, alkenes, alkynes)
What is the main source of hydrocarbons?
----Solution----
Fossil fuels like coal, petroleum, and natural gas obtained by mining and
drilling.
What are Alkanes?
,2|Page
----Solution----
They are saturated hydrocarbons because their skeleton is only
composed of C-C single bonds.
How can alkanes exist?
----Solution----
They can be linear, branched or exist in ring formations called
cycloalkanes.
Describe a higher/more complex alkane structure:
----Solution----
They will have more carbons and/or increased structural diversity.
What is the general formula of Alkanes?
----Solution----
CnH2n+2
The names of the alkanes reflect?
----Solution----
The number of carbons present.
How many isomers does each alkane have from 1-10
----Solution----
1,1,1,2,3,5,9,18,35,75
, 3|Page
Name the first ten prefix of alkanes:
----Solution----
Methane, ethane, propane, butane, pentane, hexane, heptane, octane,
nonane, decane.
As the molecular weight increases:
----Solution----
The number of isomers increase.
What does the suffix -ane mean?
----Solution----
Denotes a saturated hydrocarbon. It is used for all acyclic saturated
alkanes
What is nomenclature?
----Solution----
The naming of a molecular structure. Historically they were named after
their source, now they are systemic.
Why is nomenclature important?
----Solution----
Because we cannot remember all the prefixes since a MF composed of
carbons can have several different patterns of connectivity.
