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 23 of 28
- A. SO2
- B. Cl
- C. SO3
- D. No nucleophile is formed
Explanation: In the reaction between acetic acid and thionyl chloride, the chloride ion (Cl-) acts as the nucleophile.
Correct answer: Cl442. Carboxylic acid reacts with ammonia to form ammonium salts which on heating produces_______________?
- A. CO2
- B. Alkane
- C. Ester
- D. Acidamide
Explanation: A carboxylic acid first reacts with ammonia to form ammonium carboxylate, RCOO-NH4+, and heating removes water to form the acid amide…
Correct answer: Acidamide- A. Aromatic
- B. Dicarboxylic
- C. Hydrocarbons
- D. Fumaric acid
Explanation: Both phthalic acid and oxalic acid share the crucial characteristic of being dicarboxylic acids.
Correct answer: Dicarboxylic- A. 2 amino groups and 1 carboxylic group
- B. 1 amino and i carboxylic groups
- C. 2 carboxylic groups and 1 amino group
- D. 2 amino and 2 carboxylic groups
Explanation: Acidic amino acids have (c) 2 carboxylic groups and 1 amino group. The term "acidic" in this context refers to the presence of an…
Correct answer: 2 carboxylic groups and 1 amino group- A. Citric acid
- B. Benzoic acid
- C. Lactic acid
- D. Tartaric acid
Explanation: Citric acid is present in lemon juice. It is a natural acid that imparts the characteristic sour taste to citrus fruits, including lemons.
Correct answer: Citric acid- A. Ninhydrin test
- B. Molisch test
- C. Bluretic test
- D. Benedict test
Explanation: Citric acid is present in lemon juice. It is a natural acid that imparts the characteristic sour taste to citrus fruits, including lemons.
Correct answer: Ninhydrin test- A. CO2
- B. Alkane
- C. Ester
- D. Acetamide
Explanation: When an ammonium salt of a carboxylic acid is heated, it undergoes a dehydration reaction, losing a molecule of water (H₂O) and forming an…
Correct answer: Acetamide448. Picric acid is
- A. monocarboxyle acid
- B. aromatic carboxylic acid
- C. dicarboxylic acid
- D. none of these
Explanation: Picric acid is not a monocarboxylic acid, dicarboxylic acid, or an aromatic carboxylic acid.
Correct answer: none of these- A. C15H31COOH
- B. C13H27COOH
- C. C16H32COOH
- D. C17H35COOH
Explanation: Palmitic acid is a saturated fatty acid with 16 carbon atoms. Its formula reflects this chain length and functional groups, accurately…
Correct answer: C16H32COOH- A. proteins and oils
- B. fats and proteins
- C. fats and oils
- D. all above
Explanation: Aliphatic monocarboxylic acids have a single straight-chain hydrocarbon backbone with a carboxylic acid group at the end.Fats and oils are…
Correct answer: fats and oils- A. Carboxylic acid
- B. Ethanol
- C. Phenol
- D. Ethyne
Explanation: Acid strength decreases as pka increases, and ethyne has the highest pka (-25) among the options.
Correct answer: Ethanol- A. By the oxidation of primary alcohol
- B. By acid hydrolysis of alkane nitrite
- C. By the reaction R-Mg-Br with CO2 followed by acid hydrolysis
- D. By the reduction of aldehydes
Explanation: The reduction of an aldehyde, typically using a reducing agent like NaBH4 or LiAIH4 yields a primary alcohol.
Correct answer: By the reduction of aldehydes- A. Alkanoyl chloride
- B. Alkyl alkanoate
- C. Alkane amide
- D. Alkanal
Explanation: An alkanal is another name for an aldehyde. While aldehydes can be oxidized to carboxylic acids, they are a separate class of compounds…
Correct answer: Alkanal- A. Oxalic acid
- B. Malonic acid
- C. Adipic acid
- D. Fumaric acid
Explanation: Malonic acid is the common name for the dicarboxylic acid with three carbon atoms. Oxalic acid has two carbon atoms.
Correct answer: Malonic acid- A. LiAlH4
- B. NaBH4
- C. LiAlH4.H2O
- D. Both A and B
Explanation: LiAlH4 is a powerful reducing agent that can reduce. carboxylic acids to primary alcohols, such as converting butanoic acid to butanol…
Correct answer: LiAlH4- A. Propanoic acid
- B. Fluoroethanoic acid
- C. Trichloroethanoic acid
- D. Nitroethanoic acid
Explanation: Trichloroacetic Acid (TCA) is a much stronger acid than all the acids mentioned in the options, from a chemical ionization standpoint…
Correct answer: Trichloroethanoic acid- A. Ester & Nitriles
- B. Nitriles and Amines
- C. Alkenes and Alkynes
- D. Esters and Alcohols
Explanation: Ester hydrolysis is a reaction that breaks an ester bond with a molecule of water or a hydroxide ion to form a carboxylic acid and an…
Correct answer: Ester & Nitriles- A. Colourless liquid, vinegar like smell, sour taste
- B. Bright colour and bitter taste
- C. Colourless solid, sour taste, pungent smell
- D. All are incorrect
Explanation: Acetic acid have vinegar smell ,colorless liquid and sour taste.
Correct answer: Colourless liquid, vinegar like smell, sour taste- A. R - COOH
- B. R - CHO
- C. R - CO - R
- D. R - COO - R
- E. R- CO - NH2
Explanation: Amide functional group is given by −CO−NH2 . So (E) is correct option.
Correct answer: R- CO - NH2- A. Small sizes
- B. Polarity of C-O bond
- C. Hydrogen bonding
- D. Dipole-Dipole interactions
Explanation: Due to the presence of OH group as in COOH in the carboxylic acids ,they show hydrogen bonding and form dimers
Correct answer: Hydrogen bonding