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CHAPTER 20 REGULAR HOMEWORK:

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Question 1

THIS CHAPTER HAS LOTS OF IMAGES. IF ANY ARE MISSING GO TO THE PDF FOR CHAPTER 20 IMAGES.
What is the structural formula of 1-bromobutane?

fig

Select one:
 

 

Explanation

butane- 4 carbon alkane aka a straight carbon chain 

1-bromo- bromine on the first carbon

 

Question 2

Which of the following are the structural formula of 2-methyl-3-nitropentane?

fig
Select one or more:
 
 
 
 

 

Explanation

2 methyl - substituent on the 2nd carbon that has one carbon

3-nitropentane - substituent on the 3rd carbon of the parent chain (a 5 carbon chain)  aka a nitrous group 

 

Question 3

What is the structural formula of 2,2-dimethylhexane

fig
Select one:
 

 

Explanation

On the second carbon of the six carbon alkane there are two methyl groups aka one carbon substituents

 

Question 4

What is the structural formula of 1-chloro-1-methylcyclopentane and how many hydrogen atoms does it have?

fig
Select one or more:
 
 

 

Explanation

cyclopentane refers to a closed five carbon chain 

 

Question 5

Name the following compound.

fig
Select one:
 

 

Explanation

longest straight chain = the parent chain

hexane


2 substituent groups 

1. methyl on the 2nd carbon

2. bromo on the 4th carbon


make sure to alphabetize the substituents


4 bromo 2methylhexane

 

Question 6

Name the following compound.

fig
Select one:
 

 

Explanation

close six carbon chain = cyclohexane

1 methyl substituent


methylcyclohexane

 

Question 7

Name the following compound.

fig
Select one:
 

 

Explanation

Longest chain = octane

2 substituent groups 1) amino 2)methyl


2 amino 3 methyloctance

 

Question 8

Name the following compound.

fig
Select one:
 

 

Explanation

Longest chain =hexane

1. substituent ethyl on the 3rd carbon 


3 ethylhexane

 

Question 9

One of the following 2 compounds exists as cis and trans isomers. Check the statements which give the name of each compound.

fig
Select one or more:
 
 
 

 

Explanation

Trans isomer because the methyl groups are not on the same side

double bond is on the second carbon of the parent chain

Question 16

 
 

Question 15

Identify the type of organic compound shown.
fig
Select one:
 

 

    

Name the following compound.
ch-22-38a
Select one:
 

 

Question 15

Identify the type of organic compound shown.
fig
Select one:
 

 

Question 12

ch-22-38b
Select one:
 

 
 

Question 13


22-38c
Select one:
 

 

    

 

Question 14


Match the name with the functional group.
-OH 
-COOH 
-NH2 
C=C 
-C(O)H [double bond to O] 
-C(O)-R [double bond to O] 
-C(O)-O-R [double bond to O in ()] 

 

    

 

Question 15

Identify the type of organic compound shown.
fig
Select one:
 

 

    

 

Question 16

Fig
Select one:
 

 

    

 

Question 17

State which compound in each of the following pairs you expect to have the higher boiling point. Explain your answer.

(a) CH3OCH3 or (b) CH3CH2CH2CH=CH2

Select one or more:
 Correct
 Correct

 

Explanation

Boiling point increases with more/better intermolecular forces and because of more carbons.

 

Question 18

Select one or more:
 Correct
 Correct

 

    

    

 

Question 19

Select one or more:
 Correct
 Correct

 

    

    

 

Question 20

Name the following compound.

Select one:

 

Explanation

    

 

Question 21

Select one or more:
 Correct
 Correct

 

Explanation

A compound that is chiral has FOUR different substituent groups on it!!!!

 

Question 22

Select one:
 Correct

 

Explanation

Hybridization deals in simple terms with the number of connections the element makes in a compound with other elements (a double bond is still only one connection so for example the 1st C has 4 connections so therefore it is an sp3 while the 2nd carbon is only sp because it only has two connections.

 

Question 23

Which of the following types of organic compounds lacks an sp2-hybridized carbon center? Why?

Select one or more:
 Correct
 Correct

 

    

    

 

Question 24

Rank the following compounds according to increasing solubility in water.

I. CH3–CH2–CH2–CH3
II. CH3–CH2–O–CH2–CH3
III. CH3–CH2–OH
IV. CH3–OH

Select one:
 Correct

 

Explanation

The more polar a compound is the more likely it's solubility in water as like dissolves like

 

Question 25

Rank the following compounds according to expected increasing solubility in benzene.

I. CH3–CH2–CH2–CH3
II. CH3–CH2–O–CH2–CH3
III. CH3–CH2–OH
IV. CH3–OH

Select one:
 Correct

 

Explanation

The more non polar the compound the more likely it will be to dissolve in benzene because like dissolves like

 

Question 26

Tetracyanoethylene has the skeleton shown below. From its Lewis structure determine how many sigma and pi bonds are in the molecule.

Select one or more:
 Correct
 Correct

 

Explanation

Sigma is a single bond ( remember that double bonds have single bonds)

Pi bonds are double or triple bonds


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