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Chemistry > Aromatic Hydrocarbon > Flashcards

Aromatic Hydrocarbon Flashcards

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1
Q

Aromatic Hydrocarbons are also known as

A

Arenes

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2
Q

What are aromatic compounds?

A

Aromatic compounds are benzene and compounds that resemble benzene in chemical behaviour.

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3
Q

General formula of arenes

A

CnH2n-6y
where,
n = number of carbons
y= number of rings

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4
Q

Two benzene attached

A

Napthalene

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5
Q

Three benzene attached in a curved way

A

Phenanthrene

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6
Q

3 benzene attached

A

Anthracene

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7
Q

C6H6-COOH

A

Benzoic acid

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8
Q

C6H6-SO3H

A

Benzenesulphonic acid

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9
Q

C6H6-C=OH

A

Benzaldehyde

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10
Q

When the side chain is saturated and has less no of carbon atom in it than the benzene ring, the side chain acts as

A

Substituent

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11
Q

When saturated side chain has same no of carbon atom as benzene ring

A

benzene ring win over and the side chain is treated as substituent

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12
Q

When saturated side chain has more no of carbon atoms than benzene ring

A

benzene acts like a substituents and the word phenyl is used for benzene.

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13
Q

When the side chain is saturated or the side chain has some functional group

A

benzene behave like a substituent

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14
Q

position 1-2,6

A

ortho

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15
Q

position 1-3,5

A

meta

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16
Q

position 1-4

A

para

17
Q

The general characteristics of compound to show aromaticity are

A
  • Cyclic
  • Each element must have sp2 hybridization and molecule must beplanar
  • delocalized pi electrons above and below the plane of the molecule
  • flollow Huckel’s Rule
18
Q

State Huckel’s rule

A

The compound is aromatic if the molecule contains cyclic cloud of delocalized pi electrons above and below the plane of molecule and pi clouds must contain a total of (4n+2) pi electrons where n= 0,1,2,3,…. only whole no integers

19
Q

HUckel’s rule of aromaticity is also known as

A

(4n+2)rule

20
Q

Benzene was first isolated by

A

Faraday

21
Q

The first to suggest a ring structure for benzene was

A

Kekule

22
Q

what is resonance?

A

The phenomenon in which two or more structures can be written for a substance that has identical position of atoms is called resonance.

23
Q

How is benzene formed from acetylene?

A

When acetylene is passed through a red hot tube at 873K, it forms benzene.

24
Q

How is benzene obtained from sodium salt of carboxylic acid?

A

when sodium benzoate (C6H5CooNa) is heated with sodalime(NaOH), benzene is formed.

25
Q

Benzene from phenol?

A

When phenol vapours are passed over zinc dust, it is reduced to benzece and zinc oxide.

26
Q

Nitration in benzene

A

When benzene is heated at 60C with a nitrating mixture (Conc. Hno3 + Conc. H2SO4), nitro benzene is formed by replacing hydrogen atom by nitronium ion No2 + (electrophile)

27
Q

Halogenation in Benzene

A

Benzene reacts with halogens in the presence of Lewis acid such as FeCl3, FeBr3 or AlCl3 and give correponding halo benzene.

28
Q

Sulphonation in benzene

A

When benzene is heated with fuming sulphuric acid (conc. H2SO4 + SO3) or oleum(H2S2O7), benzene sulphonic acid is formed.

29
Q

Friedel Craft’s Alkylation: (Methylation) in benzene

A

When benzene is treated with an alkyl halide in the presence of only AlCl3, alkyl benzene is formed.

30
Q

Friedel Craft’s Acylation: Acetylation in benzene

A

When benzene is treated wit acetylchloride or acetic anhydride in the presence of anhydrous AlCl3, acyl benzene is formed.

31
Q

Hydrogenation of benzene

addition reaction

A

Benzene reacts with hydrogen in the presence of Platinum or Palladium to yield Cyclohexane.

32
Q

Chlorination of Benzene

A

Benzene reacts with three molecules of Cl2 in the presence of sun light to yield Benzene Hexa Chloride (BHC).

33
Q

What is BHC and what is it known as

A

Benzene Hexa CHloride(BHC) is a powerful insecticide which is also known as gammaxane or lindane.

Chemistry (1 decks)

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