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


13.
Among the following, which has the LEAST tendency to ionize in water?
A.
p-Methoxyphenol
B.
Cyclohexanol
C.
Phenol
D.
p-Cresol
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ANSWER :
B. Cyclohexanol
14.
Which of the following has the lowest pKa value?
A.
2,4-Dinitrophenol
B.
p-Chlorophenol
C.
Phenol
D.
p-Nitrophenol
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ANSWER :
A. 2,4-Dinitrophenol
15.
Phenoxide ion is more stable than alkoxide ion because:
A.
Phenoxide has more sigma bonds
B.
Phenoxide has higher hybridization
C.
Alkoxide has higher molecular mass
D.
Negative charge in phenoxide is delocalized over the ring
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ANSWER :
D. Negative charge in phenoxide is delocalized over the ring
16.
Which substituent will make phenol the LEAST acidic?
A.
-CN
B.
-Cl
C.
-OCH₃
D.
-NO₂
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ANSWER :
C. -OCH₃
17.
Picric acid is:
A.
2,4,6-Trichlorophenol
B.
2,4,6-Trinitrobenzoic acid
C.
2,4,6-Trinitrotoluene
D.
2,4,6-Trinitrophenol
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ANSWER :
D. 2,4,6-Trinitrophenol
18.
Why does a nitro group at para position increase the acidity of phenol significantly?
A.
It increases the bond strength of O-H bond
B.
It increases molecular weight
C.
It withdraws electrons by both -I and -M effects, stabilizing phenoxide
D.
It donates electrons to oxygen via resonance
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ANSWER :
C. It withdraws electrons by both -I and -M effects, stabilizing phenoxide
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