AnswersCT-Chemistry BProperties and Uses of Unsaturated Hydrocarbons

Properties and Uses of Unsaturated Hydrocarbons Answers

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1
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Which is composed of alkynes?

A
acetylene
B
margarine
C
rubber tires
D
polystyrene cups
2
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Consider the four hydrocarbons in the table below. One is an alkyne, and the other three are alkenes. HydrocarbonBoiling point (°C)W–23.0X –103.7Y–75.0Z –47.0If these hydrocarbons were similar in size, which one would most likely be an alkyne?

A
W
B
X
C
Y
D
Z
3

What is the name for this molecule?

Question illustration
A
3-heptyne
B
3-heptene
C
3-hexyne
D
3-hexene
4

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 combustible
5

Consider the hydrocarbon below.What is the name of this hydrocarbon?

Question illustration
A
propene
B
pentene
C
butene
D
ethene
6

Rubber is manufactured from latex that is produced from rubber trees. Which statement about rubber is true?

A
It is made from the polymerization of a long chain of aromatic molecules.
B
It is made from the polymerization of a short chain of chloroprene molecules.
C
It is made from the polymerization of a long chain of alkene molecules.
D
It is made from the polymerization of a short chain of styrene molecules.
7

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.
Option A
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.
Option B
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.
Option C
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.
Option D
8

What is the name for this molecule?

Question illustration
A
nonene
B
nonane
C
1-octyne
D
1-octene
9

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.
10

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?

Question illustration
A
a manufactured, branched-chain alkyne
B
a naturally occurring, aromatic hydrocarbon
C
a manufactured, straight-chain alkene
D
a naturally occurring, branched-chain alkene

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