Question

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

10.A four membered, cyclic, planar, completely conjugated compound with sp2 hybridized carbons and 4p (pi) electrons will be: a. Heteroaromatic      b. Aromatic               c.Nonaromatic d. Antiaromatic e. None of the above

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

A)Benzene sulfanilic acid

B)Benzene sulfonamide

C)Sulfanilic acid

D)Benzenesulfonic acid

E)Nitrobenzene

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

A)Bicyclic, aromatic

B)Substituted, antiaromatic

C)Tricyclic, aromatic

D)Alcoholic, nonaromatic

E)Acidic, antiaromatic

Answer 1

The structure of anthracene is as follows: The anthracene is an aromatic compound. it contains 7 Tt bonds and each pie bond included 2 electrons. Thus, it contains 14 π electrons. Therefore, the correct option is e.

8. The structure of thiophene is as follows: The thiophene contains a heteroatom, that is, sulphur and five-membered ring Therefore, the correctoption is D. Thiophene is a five membered beteresulic comond 10. The structure of four membered, cyclic, planar, completely conjugated compound with sp hybridized carbons and 4p (pi) electrons is as follows: el s rule says that compoun electrons. Here, n is the zero or whole must contain 4n+2 number of delocalized number The above compound follows 4n π electrons rule. Therefore, the above compound is anti- aromatic Therefore, the correct option is d.