CHEM 120 EXAM 2
• Bombykol is a pheromone secreted by the female silkworm moth to attractmales.
This compound contains two alkene double bonds. Which of the following correctly
describes the geometry around each?
Answer: the double bond at C10 istrans and the double bond at C12 is cis
• which is the correct formula for cyclopentene
Answer: C5H8
• what is the molecular formula of the simplest alkyne
Answer: C2H2
• true or false: alkenes only contain triple bonds
Answer: false
• 3-ethylcyclepentene
Answer: The term "3-ethylcyclepentene" appears to be a typographical error or
misspelling. The correct term is "3-ethylcyclopentene."
The structural formula of 3-ethylcyclopentene is as follows:
H
|
CH3 - C - CH - CH2 - CH2 - CH2
||
CH2 CH3
In this structure, 3-ethylcyclopentene is a cyclic compound with a five-membered
ring (cyclopentene). The "3-ethyl" prefix indicates that there is an ethyl group
(CH2CH3) attached to the third carbon atom in the cyclopentene ring. The
remaining carbon atoms in the ring have two hydrogen atoms each (not shown for
simplicity).
3-ethylcyclopentene is an example of a cycloalkene, which is a cyclic hydrocarbon
, with at least one carbon-carbon double bond. The ethyl group provides a branch on
the cyclic structure, and the double bond is present between the second and third
carbon atoms in the ring.
• trans-4-methyl-2-hexene
Answer: The structural formula of trans-4-methyl-2-hexene is as follows:
CH3
|
CH3 - C - CH = CH - CH2 - CH2 - CH3
||
CH2 CH3
In this structure, trans-4-methyl-2-hexene is an alkene with six carbon atoms in a
linear chain. The "trans" prefix indicates that the two methyl (CH3) groups are on
opposite sides of the double bond, and the "4-methyl" prefix indicates that there is a
methyl group (CH3) attached to the fourth carbon atom (counting from the left end
of the chain). The double bond is present between the second and third carbon
atoms in the chain.
The remaining carbon atoms in the chain are bonded to hydrogen atoms (not shown
for simplicity). Trans-4-methyl-2-hexene is an example of a branched alkene, where
a methyl group is attached to the main carbon chain.
• Sunscreens absorb UV radiation and protect the skin from its harmful effects.
Commercially available sunscreens contain a benzene ring in the structure of the
active ingredient which of the following compounds might beeffective as an active
ingredient in a commercial sunscreen?
Answer: oxybenzone
• Which of the following types of compounds is produced by the hydrationof an
alkene?
Answer: alcohol
• which of the following best describes the changes that occurred in the reaction
shown below?
Answer: an H atom and an -OH group have been added to thereactant
• Bombykol is a pheromone secreted by the female silkworm moth to attractmales.
This compound contains two alkene double bonds. Which of the following correctly
describes the geometry around each?
Answer: the double bond at C10 istrans and the double bond at C12 is cis
• which is the correct formula for cyclopentene
Answer: C5H8
• what is the molecular formula of the simplest alkyne
Answer: C2H2
• true or false: alkenes only contain triple bonds
Answer: false
• 3-ethylcyclepentene
Answer: The term "3-ethylcyclepentene" appears to be a typographical error or
misspelling. The correct term is "3-ethylcyclopentene."
The structural formula of 3-ethylcyclopentene is as follows:
H
|
CH3 - C - CH - CH2 - CH2 - CH2
||
CH2 CH3
In this structure, 3-ethylcyclopentene is a cyclic compound with a five-membered
ring (cyclopentene). The "3-ethyl" prefix indicates that there is an ethyl group
(CH2CH3) attached to the third carbon atom in the cyclopentene ring. The
remaining carbon atoms in the ring have two hydrogen atoms each (not shown for
simplicity).
3-ethylcyclopentene is an example of a cycloalkene, which is a cyclic hydrocarbon
, with at least one carbon-carbon double bond. The ethyl group provides a branch on
the cyclic structure, and the double bond is present between the second and third
carbon atoms in the ring.
• trans-4-methyl-2-hexene
Answer: The structural formula of trans-4-methyl-2-hexene is as follows:
CH3
|
CH3 - C - CH = CH - CH2 - CH2 - CH3
||
CH2 CH3
In this structure, trans-4-methyl-2-hexene is an alkene with six carbon atoms in a
linear chain. The "trans" prefix indicates that the two methyl (CH3) groups are on
opposite sides of the double bond, and the "4-methyl" prefix indicates that there is a
methyl group (CH3) attached to the fourth carbon atom (counting from the left end
of the chain). The double bond is present between the second and third carbon
atoms in the chain.
The remaining carbon atoms in the chain are bonded to hydrogen atoms (not shown
for simplicity). Trans-4-methyl-2-hexene is an example of a branched alkene, where
a methyl group is attached to the main carbon chain.
• Sunscreens absorb UV radiation and protect the skin from its harmful effects.
Commercially available sunscreens contain a benzene ring in the structure of the
active ingredient which of the following compounds might beeffective as an active
ingredient in a commercial sunscreen?
Answer: oxybenzone
• Which of the following types of compounds is produced by the hydrationof an
alkene?
Answer: alcohol
• which of the following best describes the changes that occurred in the reaction
shown below?
Answer: an H atom and an -OH group have been added to thereactant
