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

Organic Chemistry - Organic Compounds Containing Oxygen

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


7.
Which of the following resonance structures of phenol shows positive charge on oxygen?
A.
Kekulé structure of phenol
B.
Structure showing C=O⁺(H) with negative charge on ortho/para carbon
C.
Structure with negative charge on oxygen
D.
Structure with positive charge on benzene only
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ANSWER :
B. Structure showing C=O⁺(H) with negative charge on ortho/para carbon
8.
Ortho-nitrophenol is more acidic than meta-nitrophenol because:
A.
Meta position has stronger -I effect
B.
Ortho position causes steric hindrance only
C.
Ortho position causes intramolecular H-bonding only
D.
Ortho position allows effective resonance stabilization of phenoxide ion
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ANSWER :
D. Ortho position allows effective resonance stabilization of phenoxide ion
9.
Cresols are less acidic than phenol because:
A.
-CH₃ group increases molecular mass
B.
-CH₃ group is electron-releasing and destabilizes phenoxide ion
C.
-CH₃ group withdraws electrons by induction
D.
-CH₃ group provides resonance stabilization to OH
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ANSWER :
B. -CH₃ group is electron-releasing and destabilizes phenoxide ion
10.
Which one is NOT a Brönsted acid?
A.
Sodium phenoxide
B.
Picric acid
C.
p-Nitrophenol
D.
Phenol
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ANSWER :
A. Sodium phenoxide
11.
The most acidic hydrogen is present in:
A.
Water
B.
Cyclohexanol
C.
Phenol
D.
Methanol
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ANSWER :
C. Phenol
12.
Reaction of phenol with NaOH gives:
A.
No reaction occurs
B.
Sodium phenoxide and hydrogen gas
C.
Phenyl sodium and water
D.
Sodium phenoxide and water
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ANSWER :
D. Sodium phenoxide and water