Practice MCQ For Govt Pharmacist Exam, in this article we will solve, Practice MCQ on the topic, carboxylic acids- properties, under the subject Pharmaceutical organic chemistry of second semester. Read following article for your reference.
Carboxylic Acids- Properties » PHARMACAREERS
Which of the following carboxylic acids has the highest boiling point?
Heptanoic acid
Octanoic acid
Nonanoic acid
Decanoic acid
What is the IUPAC name for the compound CH₃CH₂COOH?
Ethanoic acid
Propanoic acid
Butanoic acid
Pentanoic acid
Which functional group characterizes carboxylic acids?
Aldehyde
Ketone
Carboxyl
Ester
What is the product when a carboxylic acid reacts with an alcohol in the presence of an acid catalyst?
Ester
Amide
Anhydride
Aldehyde
Which of the following carboxylic acids is commonly found in vinegar?
Formic acid
Acetic acid
Propionic acid
Benzoic acid
What is the general formula for carboxylic acids?
RCHO
RCOOH
RCOOR
RCOR
Which of the following reactions involves the decarboxylation of a carboxylic acid?
Esterification
Hydrolysis
Reduction
Kolbe-Schmitt reaction
Carboxylic acids are weak acids because they:
A) Donate a proton (H+) to water
B) Accept a proton (H+) from water
C) React with metals to form salts
D) Undergo substitution reactions
When a carboxylic acid reacts with an alcohol, it forms:
A) An ester
B) A salt
C) An amide
D) A ketone
Which of the following carboxylic acids is found in butter?
A) Formic acid
B) Acetic acid
C) Butyric acid
D) Propionic acid
Carboxylic acids can be converted into esters through a reaction with:
A) Alcohols
B) Amines
C) Aldehydes
D) Ketones
Which of the following statements is true regarding the effect of substituents on the acidity of carboxylic acids?
A) Electron-donating groups increase acidity.
B) Electron-withdrawing groups decrease acidity.
C) Substituents have no impact on acidity.
D) The effect of substituents is unpredictable.
Consider the following compounds:
Formic acid (HCOOH)
Acetic acid (CH₃COOH)
III. Chloroacetic acid (ClCH₂COOH)
Arrange them in order of increasing acidity.
A) I < II < III
B) III < II < I
C) II < I < III
D) III < I < II
Which substituent group is electron-donating and decreases the acidity of carboxylic acids?
A) Alkyl group
B) Halogen group
C) Nitro group
D) Cyano group
The inductive effect of substituents on acidity is primarily due to:
A) Resonance stabilization
B) Electron transfer through sigma bonds
C) Hyperconjugation
D) Aromaticity
Which of the following carboxylic acids is the strongest acid?
A) Benzoic acid (C₆H₅COOH)
B) p-Toluic acid (CH₃C₆H₄COOH)
C) Acetic acid (CH₃COOH)
D) Propionic acid (CH₃CH₂COOH)
An electron-withdrawing substituent:
A) Increases the stability of the carboxylate ion
B) Decreases the acidity of the carboxylic acid
C) Has no effect on acidity
D) Enhances the resonance effect
Which of the following substituents would increase the acidity of a carboxylic acid the most?
A) Fluorine (F)
B) Chlorine (Cl)
C) Bromine (Br)
D) Iodine (I)
The acidity of chloral hydrate (Cl₃CCH(OH)₂) compared to water (H₂O) is due to:
A) Resonance stabilization
B) Inductive electron withdrawal by halogens
C) Hyperconjugation
D) Aromaticity
Which group is inductively electron-donating?
A) Alkyl group
B) Nitro group
C) Carbonyl group
D) Halogen group
The acidity of chloroacetic acid (ClCH₂COOH) relative to acetic acid (CH₃COOH) is:
A) Higher
B) Lower
C) The same
D) Unpredictable
The stability of the carboxylate ion is influenced by:
A) Hyperconjugation
B) Resonance effects
C) Inductive effects
D) Aromaticity
Which substituent would have the greatest effect on increasing the acidity of a carboxylic acid?
A) -NO₂ (nitro group)
B) -OH (hydroxyl group)
C) -NH₂ (amino group)
D) -F (fluorine)
Which functional group is characteristic of carboxylic acids?
A) Carbonyl
B) Carboxyl
C) Hydroxyl
D) Ester
When an aqueous solution of an aromatic organic compound Y reacts with bromine water (Br₂), what observation would indicate the presence of a carboxylic acid?
A) Formation of a white precipitate
B) Evolution of ammonia gas
C) Effervescence due to carbon dioxide
D) No observable change
Alkaline hydrolysis of aromatic amides results in the formation of:
A) Aromatic acids
B) Amines
C) Esters
D) Alcohols
Which test can be used to detect the presence of ammonia gas (NH₃) evolved during the decomposition of amides?
A) Litmus paper test
B) Silver nitrate test
C) Bromine water test
D) Sodium bicarbonate test
The common name for ethanoic acid is:
A) Acetic acid
B) Formic acid
C) Propionic acid
D) Butyric acid
Which of the following compounds is responsible for the pleasant smell of pineapples?
A) Ethyl acetate
B) Methyl salicylate
C) Isopentyl ethanoate
D) Octyl ethanoate
What type of bond is present in the structure of an ester?
A) Single bond
B) Double bond
C) Triple bond
D) Sigma bond
Which reagent is commonly used to hydrolyze amides and regenerate the corresponding aromatic acids?
A) Sodium hydroxide (NaOH)
B) Thionyl chloride (SOCl₂)
C) Sodium carbonate (Na₂CO₃)
D) Bromine water (Br₂)
The IUPAC name for CH₃COOC₂H₅ is:
A) Ethyl ethanoate
B) Methyl propanoate
C) Ethyl propanoate
D) Methyl acetate
Which functional group is present in both carboxylic acids and esters?
A) Carboxyl
B) Ester
C) Amide
D) Hydroxyl
What is the product formed when a carboxylic acid reacts with an alcohol?
A) Ester
B) Amine
C) Aldehyde
D) Ketone
Which test can be used to distinguish between a carboxylic acid and an ester?
A) Silver mirror test
B) Fehling’s test
C) Lucas test
D) Ester hydrolysis test
The IUPAC name for CH₃CONH₂ is:
A) N-methylformamide
B) Acetamide
C) N-ethylacetamide
D) Methanamide
Which of the following compounds is commonly found in oil of wintergreen?
A) Ethyl acetate
B) Methyl salicylate
C) Isopentyl ethanoate
D) Octyl ethanoate
What color change would you observe when a moist red litmus paper is exposed to ammonia gas?
A) Red to blue
B) Blue to red
C) No change
D) Yellow to green
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