Welcome to the Phenols Acidity MDCAT MCQs with Answers. In this post, we have shared Phenols Acidity Multiple Choice Questions and Answers for PMC MDCAT 2024. Each question in MDCAT Chemistry offers a chance to enhance your knowledge regarding Phenols Acidity MCQs in this MDCAT Online Test.
The acidity of phenol is increased by:
a) Electron-donating groups
b) Electron-withdrawing groups
c) Alkyl groups
d) Aromatic groups
Phenol is more acidic than:
a) Ethanol
b) Methanol
c) Water
d) Acetic acid
Which of the following phenols is the most acidic?
a) Phenol
b) 2-Nitrophenol
c) 4-Nitrophenol
d) 2,4,6-Trinitrophenol
The presence of a hydroxyl group on the benzene ring:
a) Increases acidity
b) Decreases acidity
c) Has no effect on acidity
d) Makes phenol neutral
The acidity of phenol is decreased by:
a) Electron-withdrawing groups
b) Electron-donating groups
c) Halogen groups
d) Nitro groups
Which of the following substituents decreases the acidity of phenol the most?
a) -OH
b) -NO₂
c) -CH₃
d) -Cl
The acidity of phenol compared to alcohols is due to:
a) Delocalization of negative charge
b) Formation of phenoxide ion
c) Hydrogen bonding
d) Molecular weight
Which of the following phenols is the least acidic?
a) 2-Nitrophenol
b) 4-Nitrophenol
c) Phenol
d) 2,4-Dimethylphenol
The acidity of phenol is higher than:
a) Ethyl alcohol
b) Isopropyl alcohol
c) Water
d) Methanol
The pKa value of phenol is approximately:
a) 9.9
b) 7.0
c) 4.0
d) 10.0
In phenol, the -OH group is:
a) An electron-withdrawing group
b) An electron-donating group
c) Neutral
d) A strong acid
The acidity of phenol is greater than that of:
a) Toluene
b) Benzene
c) Aniline
d) Chlorobenzene
Which of the following groups when attached to phenol increases its acidity?
a) -CH₃
b) -OCH₃
c) -NO₂
d) -NH₂
The phenoxide ion is stabilized by:
a) Inductive effect
b) Resonance effect
c) Hydrogen bonding
d) Van der Waals forces
Phenol is more acidic than:
a) Benzyl alcohol
b) Cyclohexanol
c) Isopropanol
d) 1-Butanol
The acidity of phenol increases with:
a) Electron-donating groups
b) Electron-withdrawing groups
c) Alkyl groups
d) Halogens
The effect of the -OH group on the phenol ring is:
a) Decreases acidity
b) Increases acidity
c) No effect on acidity
d) Neutralizes the phenol
Phenol reacts with sodium hydroxide to form:
a) Sodium phenoxide
b) Sodium benzoate
c) Sodium acetate
d) Sodium alcohol
The acidity of phenol is influenced by:
a) Substituents on the ring
b) Molecular weight
c) Atomic size
d) Hydrogen bonding
The pKa of phenol is approximately:
a) 9.9
b) 7.4
c) 10.5
d) 6.3
The acidity of phenol increases when:
a) Electron-donating groups are present
b) Electron-withdrawing groups are present
c) Alkyl groups are present
d) No substituents are present
Which of the following phenols has the highest acidity?
a) Phenol
b) 2-Nitrophenol
c) 4-Nitrophenol
d) 2,4-Dimethylphenol
The acidity of phenol is greater than that of:
a) Alcohol
b) Aldehyde
c) Ketone
d) Ether
In phenol, which group has a deactivating effect on the ring, thus increasing acidity?
a) -OH
b) -CH₃
c) -NO₂
d) -Cl
Phenol’s acidity compared to alcohols is due to:
a) Electron-withdrawing effect
b) Resonance stabilization
c) Steric hindrance
d) Hydrogen bonding
The acidity of phenol compared to carboxylic acids is:
a) Higher
b) Lower
c) Equal
d) Cannot be compared
Phenol is more acidic than:
a) Methanol
b) Ethanol
c) Butanol
d) Water
The phenoxide ion is stabilized by:
a) Inductive effect
b) Resonance effect
c) Hydrogen bonding
d) Van der Waals forces
The acidity of phenol increases with:
a) Electron-donating groups
b) Electron-withdrawing groups
c) Alkyl groups
d) Halogens
Phenol in the presence of which group is most acidic?
a) -NO₂
b) -CH₃
c) -OCH₃
d) -NH₂
Phenol has a pKa value around:
a) 9.9
b) 4.0
c) 7.4
d) 10.0
The acidity of phenol increases with:
a) The presence of electron-donating groups
b) The presence of electron-withdrawing groups
c) Addition of alkyl groups
d) Addition of halogens
Phenol is more acidic than:
a) Cyclohexanol
b) Ethanol
c) Methanol
d) Tert-butyl alcohol
In phenol, an -OH group is considered:
a) A weak acid
b) A strong acid
c) Neutral
d) An electron donor
The acidity of phenol is increased by:
a) Substituents that withdraw electrons
b) Substituents that donate electrons
c) Alkyl substituents
d) Halogen substituents
Phenol reacts with which of the following to form phenoxide ion?
a) Sodium hydroxide
b) Sodium bicarbonate
c) Sodium chloride
d) Sodium carbonate
The acidity of phenol is affected by:
a) The nature of substituents on the ring
b) The presence of hydrogen bonds
c) The molecular weight
d) The type of solvent used
Phenol has a higher acidity than:
a) Primary alcohol
b) Secondary alcohol
c) Tertiary alcohol
d) All alcohols
Which of the following increases the acidity of phenol?
a) -NH₂ group
b) -CH₃ group
c) -NO₂ group
d) -OCH₃ group
The presence of which substituent decreases the acidity of phenol?
a) -NO₂
b) -CH₃
c) -COOH
d) -Cl
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