Phenol

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Phenol

Roll Number *

On heating aqueous solution of benzene diazonium chloride, which of the following is formed?

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2 points

a) benzene

b) chlorobenzene

c) phenol

d) aniline

What is the Industrial method of preparation of phenol?

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2 points

a) Dows process

b) From diazonium salt

c) By decarboxylation of salicylic acid

d) Hock method

What will be the product ‘a’ in the given reaction?

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2 points

a) Enolate form

b) Benzene diazonium chloride

c) Benzene

d) Chlorobenzene

Phenol reacts with bromine in CS2 at low temperature to give
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2 points

m-bromophenol

o-and p-bromophenol

p-bromophenol

2,4,6-tribromophenol

When phenol is treated with excess bromine water it gives
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2 points

m-bromophenol

o- and p-bromophenol

2,4-dibromophenol

2,4,6-tribromophenol

Phenol on reduction with H2 in the presence of Ni catalyst gives

2 points

benzene

toluene

cyclohexane

Cyclohexanol

Which of the following is formed when phenol is exposed to air?
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2 points

o-Benzoquinone

p-Benzoquinone

Phenoquinone

o-and p-Benzoquinone

Phenol is less acidic than
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2 points

Cresol

p-methoxyphenol

p-nitrophenol

Ethanol

The acidity of phenol is mainly due to:

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2 points

A) Resonance stabilization of phenoxide ion

B) Strong inductive effect of OH group

C) Hydrogen bonding in phenol

D) Presence of aromatic ring

Which substituent will decrease acidity of phenol?
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2 points

A) –NO₂

B) –CN

C) –CH₃

D) –COOH

Which of the following increases phenol acidity most?
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2 points

A) –OH at ortho position

B) –OCH₃ at para position

C) –NO₂ at para position

D) –CH₃ at ortho position

The order of acidity is:
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2 points

A) p-Nitrophenol > Phenol > p-Methylphenol

B) Phenol > p-Nitrophenol > p-Methylphenol

C) p-Methylphenol > Phenol > p-Nitrophenol

D) Phenol = p-Nitrophenol = p-Methylphenol

Which is more acidic?

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2 points

A) p-Chlorophenol

B) Phenol

C) p-Methylphenol

D) Cyclohexanol

The acidic strength order is:

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2 points

A) 2,4-Dinitrophenol > o-Nitrophenol > Phenol

B) o-Nitrophenol > 2,4-Dinitrophenol > Phenol

C) Phenol > o-Nitrophenol > 2,4-Dinitrophenol

D) 2,4-Dinitrophenol > Phenol > o-Nitrophenol

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