University of Texas, Rio Grande Valley CHEM 2325 1)As energy of MO increases, the number of nodes         Representative multiple choice questions         a

1)As energy of MO increases, the number of nodes

Representative multiple choice questions

a. decreases

b. remains same

c. increases

d. either (a) or (b)

e. none of the above

2

. The name of the following compound is:

a. Tetrabenzene

b. Chrysene

c. Coronene

d. Anthracene

e. Pyrene

3

. To achieve noble gas configuration, hydrogen requires………………..whereas

chlorine requires…………………in

outermost shell.

a. Octet, duet

b. Singlet, duet

c. Duet, octet

d. Octet, singlet

e. None of the above

. The ……………. the number of relatively stable resonance contributors, the

4

…………… the resonance energy.

a. Higher, lower

b. Lower, higher

c. Higher, higher

d. Lower, lower

e.

None of the above

5

. The name of the following compound is:

a. Benzene

b. Toluene

c. Formaldehyde

d. Benzaldehyde

e. Crotonaldehyde

. Phenanthrene is

6

----------------

,

----------------

compound.

a. Bicyclic

, aromatic

b. Substituted, antiaromatic

c. Tricyclic, aromatic

d. Alcoholic, nonaromatic

e. Acidic, antiaromatic

. The number of π (pi) electrons in anthracene is:

7

a. 6; b. 8; c. 10; d. 12;

e. 14

8

. Thiophene is a

---------------------------

compound.

a. Five membered carbocyclic

b. Six membered heterocyclic

c. Seven membered cyclic

d. Five membered heteroaromatic

e. Aliphatic

. The name of the following compound is:

9

a. Imidazole

b. Indole

c. Pyridine

d. Thiophene

e. Pyrrole

10

. A four membered, cyclic, planar, completely conjugated compound with sp

2

hybridized carbons and 4

pi) electrons will be:

(

a. Heteroaromatic

b. Aromatic

c. Nonaromatic

d. Antiaromatic

e. None of the above

. The following planar cation will be:

11

a. Aromatic

b. Heteroaromatic

c. Antiaromatic

d. Both (a) & (b)

e. Nonaromatic

12

. As energy of MO increases, the number of nodes

a. decreases

b. remains same

c. increases

d. Either

(

a) or (b)

e. None of the above

13

. The name of the following compound is:

a. Pyridine

b. Pyrrole

c. Pyrimidine

d. Indole

e. Imidazole

14

. Atorvastatin (Lipitor), the top selling marketed drug, is a derivative of

a. Pyrrole

b. Indole

c. Thiophene

d. Imidazole

e. None of the above

. The compound furan is ……………….

15

a. aliphatic nitrogen heterocycle

b. aromatic nitrogen heterocycle

c. carbocyclic sulfur heterocycle

d. aromatic oxygen heterocycle

e. aliphatic oxygen heterocycle

16

. The name of the following compound is……………..

.

a

.

I

n

d

ole

b. Pyrimidine

c. Naphthalene

d. Purine

e. None of the

above

. Carbocation is a typical……………….

17

a. Aromatic compound

b. Heteroaromatic compound

c. Monocyclic compound

d. catalyst

e. electrophile

18

. In Friedel

-

Crafts acylation reaction of benzene, the electrophile is

a. Benzene

b. Acylium ion

c. Alkyl radical

d. Lewis base

e. None of the above

. Lewis acid

19

is

a. Electron pair acceptor

b. Electron pair donor

c. Aromatic compound

d. Proton donor

e. None of the above

. In Friedel

20

-

Crafts reaction new bond formation takes place between:

a. Carbon and a nitrogen atom

b. Carbon and a bromine atom

c. Carbon and a sulfur atom

d. Two carbon atoms

e. No new bond is formed

. The stability of the carbocations is as follow:

21

a. 1

carbocation > 2

carbocation > 3

carbocation

b. 2

carbocation > 3

carbocation > 1

carbocation

c. 2

carbocation >

1

carbocation > 3

carbocation

d. 3

carbocation > 2

carbocation > 1

carbocation

e. None of the above

. In the reaction “sulfonation of benzene” the name of the product is

22

a. Benzene sulfanilic acid

b. Benzene sulfonamide

c. Sulfanilic acid

d.

Benzenesulfonic acid

e. Nitrobenzene

. The main product in the Friedel

23

-

Crafts acylation reaction is:

a. Alkyl halide

b. Carbocation

c. Alcohol

d. Bromobenzene

e. Ketone

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