University of Texas, Rio Grande Valley CHEM 2325 1)In case of covalent non-polar bond the difference in electronegativity between two bonded atoms is In case of covalent polar bond the difference in electronegativity between two bonded atoms is between 3

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

4.

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

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

6.

Phenanthrene is ----------------, ---------------- compound.

a. Bicyclic, aromatic

b. Substituted, antiaromatic

c. Tricyclic, aromatic

d. Alcoholic, nonaromatic

e. Acidic, antiaromatic

7.

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

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

9.

The name of the following compound is:

a. Imidazole

b. Indole

c. Pyridine

d. Thiophene

e. Pyrrole

10.

A four membered, cyclic, planar, completely conjugated compound with sp2 hybridized

carbons and 4?

 (pi) electrons will be: a. Heteroaromatic b. Aromatic c. Nonaromatic

d.

Antiaromatic

 e. None of the above

11.

The following planar cation will be:

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

15.

The compound furan is ...................

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. Indole b. Pyrimidine

c. Naphthalene

 d. Purine e. None of the above

17.

Carbocation is a typical...................

a. Aromatic compound

b. Heteroaromatic compound

c. Monocyclic compound

d. catalyst

e. electrophile .

18.

In Friedel-Crafts acylation reaction of benzene, the electrophile is

Benzene

Acylium ion

Alkyl radical

Lewis base

None of the above

19.

Lewis acid is

Electron pair acceptor

Electron pair donor

Aromatic compound

Proton donor

None of the above

20.

In Friedel-Crafts reaction new bond formation takes place between:

Carbon and a nitrogen atom

Carbon and a bromine atom

Carbon and a sulfur atom

Two carbon atoms

No new bond is formed

21.

The stability of the carbocations is as follow:

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

22.

In thereaction “sulfonation of benzene” the name of the product is

Benzene sulfanilic acid

Benzene sulfonamide

Sulfanilic acid

Benzenesulfonic acid

Nitrobenzene

23.

The main product in the Friedel-Crafts acylation reaction is:

Alkyl halide

Carbocation

Alcohol

Bromobenzene

Ketone

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