Phenols( Acidic Nature, Electrophilic Substitution Reactions...) NEET Questions

Organic Chemistry - Organic Compounds Containing Oxygen
Phenols( Acidic Nature, Electrophilic Substitution Reactions...)

Phenols( Acidic Nature, Electrophilic Substitution Reactions...) MCQ Questions


1.
Which of the following is the strongest acid?
A.
p-Cresol
B.
2,4,6-Trinitrophenol
C.
Phenol
D.
Ethanol
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ANSWER :
B. 2,4,6-Trinitrophenol
2.
The correct order of acidic strength is:
A.
Phenol > p-Nitrophenol > p-Cresol > p-Chlorophenol
B.
p-Cresol > Phenol > p-Chlorophenol > p-Nitrophenol
C.
p-Nitrophenol > p-Chlorophenol > Phenol > p-Cresol
D.
p-Chlorophenol > p-Nitrophenol > p-Cresol > Phenol
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ANSWER :
C. p-Nitrophenol > p-Chlorophenol > Phenol > p-Cresol
3.
Phenol is more acidic than ethanol because:
A.
Phenol contains aromatic ring only
B.
Ethanol has stronger O-H bond
C.
Phenol has lower molecular mass
D.
Phenoxide ion is stabilized by resonance
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ANSWER :
D. Phenoxide ion is stabilized by resonance
4.
Which compound will NOT react with NaOH but WILL react with Na metal?
A.
Ethanol
B.
p-Nitrophenol
C.
Phenol
D.
Picric acid
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ANSWER :
A. Ethanol
5.
Which of the following has highest pKa value?
A.
Ethanol
B.
o-Nitrophenol
C.
p-Nitrophenol
D.
Phenol
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ANSWER :
A. Ethanol
6.
The correct order of acidity among the following is: (I) Phenol (II) o-Cresol (III) o-Nitrophenol (IV) o-Chlorophenol
A.
IV > III > II > I
B.
I > II > III > IV
C.
III > IV > I > II
D.
II > I > IV > III
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ANSWER :
C. III > IV > I > II
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