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 16 of 28
- A. 4
- B. 5
- C. 6
- D. 7
Explanation: Valeric acid is a carboxylic acid with the IUPAC name pentanoic acid. It consists of a straight chain of 5 carbon atoms (C5H10O2), which…
Correct answer: 5- A. It decomposes on increasing temperature
- B. It has a lesser degree of ionization
- C. It has a -COOH group
- D. It has more inductive effect
Explanation: It has a lesser degree of ionization - Correct. Acetic acid (CH₃COOH) is weak because it only partially ionizes in water, unlike sulfuric…
Correct answer: It has a lesser degree of ionization- A. Decreases in molecular mass
- B. Increases in molecular mass
- C. Increases the amount of acid
- D. Decreases the amount of water
Explanation: Increases in molecular mass - Correct. Higher molecular mass acids have larger nonpolar hydrocarbon chains, reducing solubility.
Correct answer: Increases in molecular mass- A. Acetic acid
- B. Oxalic acid
- C. Diethanoic acid
- D. Ethandioc acid
- E. Benzoic acid
Explanation: The common name for the compound HOOC-COOH is oxalic acid. It is also iupac known as "ethanedioic acid".
Correct answer: Ethandioc acid- A. Adipic acid
- B. Propionic acid
- C. Formic acid
- D. Caproic acid
- E. Butyric acid
Explanation: As mentioned in STB, the IUPAC name is Caproic acid. So option D is correct answer.
Correct answer: Caproic acid- A. CH3CH2COOH
- B. CH2CICH2COOH
- C. CH3CHCI2COOH
- D. CH3CH2CH2COOH
Explanation: The compound with the least pH (highest acidity) is CH3-CH-Cl2-COOH (2,2-dichloropropanoic acid) due to the presence of two chlorine…
Correct answer: CH3CHCI2COOH- A. Carboxylic acids have greater melting points
- B. Dicarboxylic acids have greater melting points
- C. Both acids have similar melting points
- D. No consistent trends exits
Explanation: The presence of an additional carboxyl group (-COOH) in dicarboxylic acids leads to stronger intermolecular forces compared to carboxylic…
Correct answer: Dicarboxylic acids have greater melting points- A. Acetic acid is a stronger acid than monochloroacetic acid.
- B. Acetic acid is a stronger acid than propionic acid.
- C. Acetic acid is a weaker acid than Trichloroacetic acid.
- D. Acetic acid is a weaker acid than formic acid.
Explanation: Monochloroacetic acid Cl−CH2−COOH is the strongest acid than acetic acid CH3−COOH. −Cl is an electron withdrawing group.
Correct answer: Acetic acid is a stronger acid than monochloroacetic acid.- A. Butyric acid
- B. Formic acid
- C. Caroic acid
- D. Propionic acid
- E. Valeric acid
Explanation: **Formic acid** (HCOOH) is the simplest carboxylic acid with a pungent odor.
Correct answer: Formic acid- A. PCl3
- B. H2SO4
- C. HNO3
- D. HCI
- E. СН3ОН
Explanation: Methanol is a very weak acid with a much higher pKa (around 15.5) compared to carboxylic acids (pKa around 4-5).
Correct answer: СН3ОН- A. 19
- B. 27
- C. 22
- D. 25
- E. 28
Explanation: The correct answer is 22. This includes the 20 standard amino acids that are the building blocks of proteins, plus 2 special amino acids…
Correct answer: 22- A. Tartaric acid
- B. Lactic acid
- C. Phthalic acid
- D. Formic acid
Explanation: 2-hydroxypropanoic acid is commonly known as lactic acid. It has a hydroxy group (-OH) attached to the second carbon of propanoic acid…
Correct answer: Lactic acid- A. Amides
- B. Acyl chloride
- C. Esters
- D. Acid anhydride
Explanation: When a carboxylic acid reacts with an alcohol in the presence of sulfuric acid, an ester is formed through a process called…
Correct answer: Esters- A. Folic acid
- B. Glutamic acid
- C. Glycine
- D. Lysine
Explanation: Folic acid is a B vitamin (B9) crucial for DNA synthesis, repair, and cell division and is essential during pregnancy for fetal development.
Correct answer: Folic acid315. When CO2 reacts with propyl magnesium chloride followed by acid hydrolysis, the product formed is
- A. Butanoic acid
- B. Ethanoic acid
- C. Pentanoic acid
- D. Propanoic acid
Explanation: The reaction of CO2 with propyl magnesium chloride is a Grignard reaction that produces a carboxylic acid.
Correct answer: Butanoic acid- A. Acetic acid
- B. Formic acid
- C. Methanol
- D. Propanoic acid
Explanation: The oxidation of methanal (formaldehyde) results in the formation of methanoic acid (formic acid).
Correct answer: Formic acid- A. 1,2-Ethanedioic acid
- B. 1,3-Propanedioic acid
- C. 1,4-Butanedioic acid
- D. 1,6-Hexadecanoic acid
Explanation: The correct IUPAC name for Malonic acid is 1,3-Propanedioic acid. Malonic acid consists of a three-carbon chain with two carboxyl groups…
Correct answer: 1,3-Propanedioic acid- A. Ethanal
- B. Ethane
- C. Ethanoic acid
- D. Ethanol
Explanation: The reduction of acetic acid with lithium aluminium hydride (LiAlH₄) results in the formation of ethanol.
Correct answer: Ethanol- A. Dehydration reaction
- B. Dehydrogenation reaction
- C. Esterification reaction
- D. Reduction reaction
Explanation: When an alcohol reacts with a carboxylic acid, an esterification reaction occurs, producing an ester and water.
Correct answer: Esterification reaction- A. ethanal
- B. ethanol
- C. methanoic acid
- D. methyl cyanide
Explanation: The hydrolysis of methyl cyanide is an effective method to produce acetic acid, involving the conversion of the nitrile functional group…
Correct answer: methyl cyanide