Free Carboxylic Acids MCQs with Answers
550 Carboxylic Acids MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Carboxylic acids are named and studied through the combined effects of the carbonyl and hydroxyl groups, their preparation, acidity and hydrogen bonding. Reactions include neutralisation, esterification, reduction and conversion into acid chlorides, anhydrides, esters and amides, with emphasis on how these derivatives interconvert.
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Read the Carboxylic Acids notesFree MDCAT chapter notes with key terms550 questions · page 4 of 28
- A. Butanol
- B. Butanoic acid
- C. Butanone
- D. All of these
Explanation: Butanol is the correct starting compound because it is a primary alcohol.
Correct answer: Butanol- A. Alcohol
- B. Ketone
- C. Ether
- D. Aldehyde
Explanation: Aldehydes are easily oxidized to carboxylic acids with 0.5 moles of oxygen per mole of aldehyde, consistent with the reaction conditions…
Correct answer: Aldehyde- A. Periodic acid:
- B. Lead tetraacetate:
- C. Acidified KMnO4:
- D. Both (A) & (B):
Explanation: Ethylene glycol can be oxidized into a carboxylic acid using acidified potassium permanganate (KMnO4).
Correct answer: Acidified KMnO4:- A. Ants
- B. Butter
- C. Milk
- D. Vinegar
Explanation: Acetic acid is typically isolated from vinegar, which is a dilute solution of acetic acid that is produced by the fermentation of ethanol…
Correct answer: Vinegar- A. fats and oils
- B. proteins and oils
- C. fats and proteins
- D. fats only
Explanation: Fats and oils are hydrolyzed to form aliphatic monocarboxylic acids.
Correct answer: fats and oils- A. Aromatic compounds
- B. Alcohols
- C. Carboxylic acid
- D. Ethers
Explanation: When carbon dioxide (CO₂) reacts with a Grignard reagent (RMgX), a carboxylic acid is formed.
Correct answer: Carboxylic acid- A. CCl3COOH<CHCl2COOH<CH2ClCOOH<CH3COOH
- B. CHCl2COOH<CH2ClCOOH<CH3COOH<CCl3COOH
- C. CH2ClCOOH<CH3COOH<CCl3COOH<CHCl2COOH
- D. CH3COOH<CH2ClCOOH<CHCl2COOH<CCl3COOH
Explanation: The acidity of carboxylic acids is influenced by the presence of electron-withdrawing groups, such as chlorine atoms.
Correct answer: CH3COOH<CH2ClCOOH<CHCl2COOH<CCl3COOH- A. Acetic acid
- B. Ascorbic acid
- C. Butyric acid
- D. Picric acid
Explanation: Picric acid (2,4,6-trinitrophenol) does not have a COOH group. Instead, it has a phenol group (-OH) with three nitro groups (-NO2)…
Correct answer: Picric acid- A. Tollen's test
- B. Fehling's test
- C. Iodoform test
- D. Sodium bicarbonate test
Explanation: The sodium bicarbonate test is the correct option. It is a chemical test used to distinguish between benzoic acid and ethyl benzoate.
Correct answer: Sodium bicarbonate test- A. H2/Ni
- B. Pd/C
- C. HI/P
- D. LiAlH4
Explanation: "HI" reduces carboxylic acid to alkanes in the presence of "P" as a catalyst as it is a strong reducing agent.
Correct answer: HI/P- A. Formic acid & acetic acid
- B. Acetic acid & acetic acid
- C. Acetone & formic acid
- D. Acetic acid & acetone
Explanation: Formic acid contains both a carboxyl group and an aldehyde group, which allows it to react with Na2CO3 to produce effervescence and with…
Correct answer: Formic acid & acetic acid- A. Water, Alcohol, Ether
- B. HCl, HBr, HI
- C. Bromine water
- D. All of these options are correct
Explanation: Option A: Acetic acid is infinitely miscible in water, alcohol, glycerol, ether, and carbon tetrachloride.
Correct answer: Water, Alcohol, Ether73. Which of the following compounds has the empirical formula, (CH2O) and reacts with sodium hydroxide?
- A. Carbonic acid
- B. Ethanol
- C. Acetic acid
- D. Methanoic acid
Explanation: Acetic acid (CH3COOH) has the empirical formula CH2O, as the molecular formula can be simplified to CH2O by dividing each subscript by the…
Correct answer: Acetic acid- A. Chloroethanoic acid
- B. Ethanoic acid
- C. Ethylamine
- D. Phenol
Explanation: The lowest pH corresponds to the strongest acid. Chloroethanoic acid is a stronger acid than ethanoic acid and phenol due to the…
Correct answer: Chloroethanoic acid- A. Catalyst
- B. Formation of ester
- C. Formation of salt
- D. Formation of water
Explanation: When a carboxylic acid is reacted with a base, such as sodium hydroxide, it undergoes neutralization to form salt and water.
Correct answer: Formation of water- A. CH3 - NH2
- B. O||CH3 - C - NH2
- C. O||CH3 - C - H
- D. CH3 - C ≡ N
Explanation: Option c is correct because it corresponds to the formation of acetamide through the reaction between acetic acid and ammonia, leading to…
Correct answer: O||CH3 - C - H- A. Ethyl amine
- B. Ethyl Nitrile
- C. Ethyl Diazonium Chloride
- D. Ammonium Acetate
Explanation: Carboxylic acids react with ammonia to form ammonium salts which on heating produce acid amides.
Correct answer: Ammonium Acetate- A. Ester
- B. Anhydride
- C. Acid amide
- D. Ether
Explanation: Option c is the correct answer. An ester functional group is characterized by the formula RCOOR', where R and R' are alkyl or aryl groups.
Correct answer: Ester- A. Hydration
- B. Saponification
- C. Hardening
- D. Dehydration
Explanation: Saponification is the reaction of triglycerides (fats and oils) with alkalies (such as sodium hydroxide or potassium hydroxide) to produce…
Correct answer: Saponification- A. HCOOH + SOCl2 -> HCOCI + SO2 + HCI
- B. CH3CH2COOH + 2SOCl -> CH3CH2COCl + SO2 + HCI
- C. CH3CH2COOH + 2SOCl -> CH3CH2COC1 + SO3 + HCI
- D. CH3COOH + SOCl2 -> CH3COCl + SO2 + HCI
Explanation: Thionyl chloride is SOCl2 and it reacts with carboxylic acids to form acyl chlorides.Options B and C do not involve thionyl chloride, it…
Correct answer: CH3COOH + SOCl2 -> CH3COCl + SO2 + HCI