Arenes

Question 1

Arenes

Answer 1

Cyclic unsaturated hydrocarbon that are derived from benzene,C6H6
Aromatic compounds
Contain phenyl functional gp,C6H5

Question 2

Arenes are ______ compounds.

Answer 2

Aromatic compound
Cyclic unsaturated

Question 3

Functional gp of arenes

Answer 3

C6H5 phenyl

Question 4

Benzene

Answer 4

Hezagonal ring of six carbon contain alternating double bonds

Question 5

Each carbon of benzene ring is _____ hybridization.

Answer 5

sp2 hybridization (120)

Question 6

Bonds in benzene

Answer 6

3 single bonds (3 sigma bonds)
3 double bonds (3 sigma bonds & 3 pi bonds)

All bonds are equal in length

Question 7

In benzene ring,each p orbital is _______ to six-membered ring.

Answer 7

perpendicular

Question 8

Benzene rings contain ______ electrons.

Answer 8

delocalized pi electrons and they are equally shared in the ring structure.Therefore,bonds in benzene are equal in length.

Question 9

Physical properties of benzene

Answer 9

1)Colorless liquid
2)Highly flammable
3)Insoluble in water (non polar molecule)
4)Soluble in organic solvent

Question 10

Chemical properties of benzene

Answer 10

Electrophilic substitution
a.Halogenation
b.Nitration
c.Sulfonation
d.Alkylation
e.Aceylation

Not undergoes addition (hydrogenation) reaction at normal temperature

Question 11

Why benzene don’t undergoes addition reaction easily?

Answer 11

Bcus it would disrupt the aromatic ring stability

Question 12

Halogenation of benzene

Answer 12

Addition of Halogen
Catalyst-AlCl3 in dry ether

Question 13

Nitration of benzene

Answer 13

Addition of nitric acid
Catalyst-conc H2SO4 at 50 degree
Product-Nitro benzene

Question 14

Sulfonation of benzene

Answer 14

Addition of sulfuric acid
Catalyst-heat
Product-Benzene sulfonic acid