Chemistry Chapter 18 1 What is the structure for p-aminobenzoic acid (PABA)

Chapter Eighteen

1.

Toluene is the common name for:

A)

hydroxybenzene

B)

aminobenzene

C)

methylbenzene

D)

ethylbenzene

E)

methoxybenzene

Ans:

C

2.

Anisole is the common name for:

A)

hydroxybenzene

B)

aminobenzene

C)

methylbenzene

D)

ethylbenzene

E)

methoxybenzene

3.

Phenol is the common name for:

A)

hydroxybenzene

B)

aminobenzene

C)

methylbenzene

D)

ethylbenzene

E)

methoxybenzene

Ans:

A

4.

o-xylene is the common name for:

A)

hydroxybenzene

B)

aminobenzene

C)

1,2-dimethylbenzene

D)

ethylbenzene

E)

1,3-dimethylbenzene

5.

What is the IUPAC name for the following compound?

OH

Br

A)

5-bromophenol

B)

3-bromophenol

C)

5-bromoaniline

D)

3-bromoaniline

E)

1-bromophenol

Ans:

B

6.

Which of the following is another name for 4-chlorobenzaldehyde?

A)

o-chlorobenzaldehyde

B)

m- chlorobenzaldehyde

C)

p-chlorobenzaldehyde

D)

styrene

E)

1-chlorobenzaldehyde

Ans:

C

Ans:

C

7.

What is the IUPAC name for the following compound?

NH2

Br

NO2

A)

5-bromo-4-nitroaniline

B)

5-bromo-p-nitroaniline

C)

1-bromo-2-nitroaniline

D)

3-bromo-4-nitroaniline

E)

p-nitro-m-bromoaniline

8.

What is the correct structure for 4-amino-2-chlorophenol?

NH2

Cl

OH

NO2

Cl

OH

NH2

Cl

CH

O

NO2

Cl

OCH3

OH

Cl

NH2

I II III

IV V

A)

I

B)

II

C)

III

D)

IV

E)

V

Ans:

D

Ans:

D

9.

What is the correct order of the names for the following compound?

III III

A)

I-naphthalene; II-triphenyl; III-biphenyl

B)

I-naphthalene; II-phenanthrene; III-biphenyl

C)

I-biphenyl; II-anthracene; III-naphthalene

D)

I-naphthalene; II-anthracene; III-biphenyl

E)

I-biphenyl; II- phenanthrene; III-naphthalene

10.

What is the IUPAC name for the following compound?

NH2

Cl

A)

3,4-dichloroaniline

B)

2,4-dichloroaniline

C)

2,5-dichloroaniline

D)

3,6-dichloroaniline

E)

2,6-dichloroaniline

Ans:

C

Ans:

C

11.

What is the IUPAC name for the following compound?

OH

A)

4-butylphenol

B)

1-sec-butylphenol

C)

4-propylphenol

D)

4-sec-butylphenol

E)

1-isobutylphenol

12.

What is the IUPAC name for the following compound?

NO2

COH

O

A)

6-ethyl-3-nitrobenzoic acid

B)

1-ethyl-4-nitrobenzoic acid

C)

2-ethyl-5-nitrobenzoic acid

D)

2-ethyl-5-nitrobenzaldehyde

E)

4-nitro-3-carboxyethylbenzene

Ans:

C

Ans:

D

13.

What is the structure for 1,3-diphenylbutane?

14.

What is the structure for p-aminobenzoic acid (PABA)?

15.

What is the IUPAC name for the following compound?

O

F

H

Ans:

2-ethyl-4-fluoro-5-methylbenzaldehyde

16.

What is the IUPAC name for the following compound?

NO2

H3CO

Cl

17.

What is the IUPAC name for the following compound?

Ans:

Phenanthrene

18.

What is the structure of styrene?

Ans:

4-chloromethyl-2-nitroanisole

19.

What is the structure for 3-isobutyl-5-isopropylaniline?

20.

What is the structure for 4-amino-2-bromophenol?

OH

NH2

Br

OH

Br

H2N

OCH3

Br

NH2

OCH3

NH2

Br

OH

NH2

Br

III III IV V

A)

I

B)

II

C)

III

D)

IV

E)

V

Ans:

B

21.

Which one of the following statement is not true for a compound to be considered as

aromatic?

A)

The compound must be cyclic and planar

B)

The compound must be monocyclic.

C)

The compound must have a conjugated system with p orbital at every vertex

D)

The compound must satisfy Hückel’s rule –must have (4n + 2) electrons.

E)

none of these

Ans:

B

22.

What is the main difference between an aromatic and antiaromatic compound?

A)

Aromatic compounds must be cyclic and planar, but not antiaromatic compounds

B)

Aromatic compounds must be monocyclic.

C)

Antiaromatic compounds must have a conjugated system with p orbital at every vertex

D)

Aromatic compounds must satisfy Hückel’s rule.

E)

none of these

Ans:

D

23.

The number of π electrons present in an antiaromatic compound:

A)

4n + 2

B)

2n + 2

C)

4n

D)

none

E)

none of these

Ans:

C

24.

The number of π electrons present in an aromatic compound:

A)

4n + 2

B)

2n + 2

C)

4n

D)

none

E)

None of these

Ans:

A

25.

Using a Frost circle, draw the molecular orbital energy diagram for the cyclopropenyl

anion and predict if it is aromatic.

26.

Using a Frost circle, draw the molecular orbital energy diagram for the cyclopentadienyl

anion and predict if it is aromatic.

27.

Using a Frost circle, draw the molecular orbital energy diagram for the tropylium cation

and predict if it is aromatic.

28.

Using a Frost circle, draw the molecular orbital energy diagram for the

cyclononatetraenyl cation and predict if it is aromatic.

29.

Which one of the following compound is aromatic?

S

O

III III IV

A)

I

B)

II

C)

III

D)

IV

E)

None of these

30.

Which one of the following compound is antiaromatic?

NN

H

N

HH

H

N

III

III IV

A)

I

B)

II

C)

III

D)

IV

Ans:

B

Ans:

D

31.

Which one of the following compound is nonaromatic?

N

H

N

III

III IV V

A)

I

B)

II

C)

III

D)

IV

E)

V

32.

Which one of the following compound is aromatic?

III III IV

A)

I

B)

II

C)

III

D)

IV

Ans:

C

Ans:

B

33.

Which one of the following compound is nonaromatic?

N

H

II

O

III

N

H

O

IV

B CH3

I

A)

I

B)

II

C)

III

D)

IV

34.

Which one of the following compound is aromatic?

N

H

II

O

III

N

H

O

IV

B CH3

I

A)

I

B)

II

C)

III

D)

IV

Ans:

A

Ans:

B

35.

Which one of the following compound(s) is antiaromatic?

N

H

II

O

III

N

H

O

IV

B CH3

I

A)

I

B)

II

C)

III

D)

IV

E)

III & IV

36.

Which one of the following compounds is aromatic?

B

H

I

N

H

O

IV

II III

A)

I

B)

II

C)

III

D)

IV

Ans:

A

Ans:

E

37.

Which one of the following compounds is antiaromatic?

S O N

H

B

H

III III IV V

A)

I

B)

II

C)

III

D)

IV

E)

V

38.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

O

hybridized.

39.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

S

Ans:

IV

40.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

41.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

O

42.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

O

43.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

N

H

44.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

N

H

O

45.

Classify the following compound as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

N

H

N

46.

Classify the following compounds as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

O

III

47.

Classify the following compounds as aromatic, antiaromatic, or nonaromatic. Explain

your choice.

N

H

OS

O

III IV

II

I

N

H

N

O

NH2