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 21 of 28
- A. Glycine
- B. Histidine
- C. Lysine
- D. Aspartic acid
Explanation: Glycine is considered a neutral amino acid because its side chain consists of just a hydrogen atom, making it non-polar and neutral in…
Correct answer: Glycine- A. Essential
- B. Non-essential
- C. Acidic
- D. Basic
Explanation: Non-essential amino acids are those that the body can synthesize on its own, so they do not need to be obtained from the diet.
Correct answer: Non-essential- A. Acidic
- B. Basic
- C. Neutral
- D. All
Explanation: Option d is correct because amino acids can indeed be classified into acidic, basic, and neutral categories based on the properties of…
Correct answer: All- A. Peptide
- B. Polypeptide
- C. Protein
- D. Dipeptide
Explanation: Polypeptides are chains of amino acids connected by peptide bonds. By convention, polypeptides typically refer to chains with molecular…
Correct answer: Polypeptide- A. Distillation
- B. Fermentation
- C. Ozonolysis
- D. Esterification
Explanation: Acetic acid can be commercially produced through the fermentation of sugars or ethanol by acetic acid bacteria.
Correct answer: Fermentation- A. Acetic anhydride
- B. Acetyl chloride
- C. Acetamide
- D. Ethyl ethanoate
Explanation: Acetamide cannot be prepared directly from acetic acid. It is typically synthesized by reacting acetic acid with ammonia or an amine…
Correct answer: Acetamide- A. H2/Ni
- B. HI/P
- C. NaBH4
- D. LiAlH4
Explanation: Lithium aluminum hydride is a strong reducing agent capable of reducing a wide range of functional groups, including carboxylic acids to…
Correct answer: LiAlH4- A. Formic acid
- B. Acetic acid
- C. Benzoic acid
- D. Butanoic acid
Explanation: Acetic acid, commonly known as vinegar when diluted, is widely used for seasoning food.
Correct answer: Acetic acid- A. Carbon
- B. Hydrogen
- C. Nitrogen
- D. Sulphur
Explanation: While sulfur is commonly found in many proteins, not all proteins contain sulfur.
Correct answer: Sulphur- A. CaCO3
- B. CuO
- C. Na-metal
- D. CH3OH
Explanation: Na-metal is correct because it reacts with both ethanol and ethanoic acid at room temperature.
Correct answer: Na-metal- A. Na
- B. Fe
- C. Al
- D. Cu
Explanation: Na (sodium), is correct because it is a more reactive metal compared to the other options listed.
Correct answer: Na- A. Malonic acid
- B. Valeric acid
- C. Maleic acid
- D. Succinic acid
Explanation: Valeric acid is not a dicarboxylic acid. Valeric acid, also known as pentanoic acid, is a straight-chain fatty acid with the chemical…
Correct answer: Valeric acid- A. Trans esterification
- B. Dehydration
- C. Hydrolysis
- D. Decarboxylation
Explanation: Hydrolysis is the chemical process in which a molecule is broken down by the addition of water.
Correct answer: Hydrolysis- A. Lysine
- B. Glycine
- C. Alanine
- D. Aspartic acid
Explanation: Glycine is the correct answer because it is the simplest amino acid with a hydrogen atom as its side chain.
Correct answer: Glycine- A. S2Cl2
- B. SOCl2
- C. HCl
- D. HOCl
Explanation: SOCl2 is correct because it is commonly used in the conversion of carboxylic acids to acid chlorides through an acyl chloride…
Correct answer: SOCl2- A. CH3Cl
- B. CH3COCl
- C. HCl
- D. SO2
Explanation: This is not formed in the reaction between acetic acid and thionyl chloride. Acetyl chloride (CH3COCl) is formed instead
Correct answer: CH3Cl- A. LiAlH4
- B. HI and Red P
- C. P2O5
- D. SOCl2 and pyridine
Explanation: HI (hydroiodic acid) and red phosphorus, is used to reduce carboxylic acids to alkanes.
Correct answer: HI and Red P- A. HCOOH
- B. CH3CH2COOH
- C. CH3COOH
- D. ClCH2COOH
Explanation: The weakest carboxylic acid is indeed option (B) CH3CH2COOH, also known as propanoic acid.
Correct answer: CH3CH2COOH- A. Distillation
- B. Fermentation
- C. Ozonolysis
- D. Esterification
Explanation: Acetic acid is primarily manufactured through the fermentation process, where ethanol (alcohol) is oxidized by acetic acid bacteria to…
Correct answer: Fermentation- A. A hydroxyl group
- B. A carboxyl group
- C. A hydroxyl and carboxyl group
- D. A carboxyl and an aldehydic group
Explanation: B is correct because a carboxylic acid contains a carboxyl group, which consists of a carbonyl group (C=O) and a hydroxyl group (-OH)…
Correct answer: A carboxyl group