Properties and Uses of Unsaturated Hydrocarbons Answers
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Which property is characteristic of alkenes, alkynes, and aromatic hydrocarbons?
A
Their vapor pressures decrease as their size increases.B
Their pH values are greater than 7.C
They are insoluble in water.D
They are soluble in water.2
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What is the name of a hydrocarbon that has the formula CH3(CH2)4CCH?
A
6-heptyneB
1-hepteneC
1-heptyneD
6-heptene3
Which is composed of aromatic hydrocarbons?
A
clothingB
barbeque fuelC
pain relieversD
polyvinyl chloride4
Plant oils are made up of small organic molecules that are called terpenes. The compound below is an example of one type of terpene.Which best describes this compound?
A
a manufactured, branched-chain alkyneB
a naturally occurring, aromatic hydrocarbonC
a manufactured, straight-chain alkeneD
a naturally occurring, branched-chain alkene5
Which is a property of alkynes?
A
Alkynes have a neutral pH.B
Alkynes tend to be acidic.C
Alkynes tend to be soluble in water.D
Alkynes are not combustible7
Consider the hydrocarbon below.What is the name of this hydrocarbon?
A
propeneB
penteneC
buteneD
ethene8
Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes?
A
Identify the longest chain of carbon atoms.B
Examine the multiple bond for cis- and trans- isomers.C
Number the chain of carbons, starting with the end nearest the multiple bond.D
Add a number prefix indicating the first carbon atom in the multiple bond.9
How are the vapor pressure and boiling point of alkynes affected as the chain length increases?
A
Both vapor pressure and boiling point decrease.B
Both vapor pressure and boiling point increase.C
Vapor pressure increases, and boiling point decreases.D
Vapor pressure decreases, and boiling point increases.10
Which of the molecules below is propyne?
A
Two carbons are double bonded to each other; the pair is single bonded to H above left, below left, and below right, and to C H 3 above right.
B
Two carbons are double bonded to each other; the pair is single bonded to C H 3 above left and right, and to H below left and right.
C
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C with H above and below and yet another C to the right; the final C is bonded to H above, below, and right.
D
An H is single bonded to C, which is triple bonded to another C, which in turn is single bonded to a C which is bonded to H above, below, and right.
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