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 3 of 28
- A. Propionic acid
- B. Cinnamic acid
- C. Pyruvic acid
- D. Tartaric acid
Explanation: Lactic acid, CH3CH(OH)COOH, contains a secondary alcohol group that alkaline potassium permanganate oxidizes to a ketone, giving…
Correct answer: Pyruvic acid- A. Depression of freezing point
- B. Volumetric method
- C. Victor Meyer's method
- D. Osmosis method
Explanation: For a monobasic organic acid, volumetric analysis gives the amount of base required for neutralisation and can be used to calculate the…
Correct answer: Volumetric method- A. 3-Hydroxy propanoic acid
- B. 2-Hydroxy propanoic acid
- C. 2-hydroxy butanoic acid
- D. 3-hydroxy butanoic acid
Explanation: Lactic acid has the structure CH3-CH(OH)-COOH, so its systematic name is 2-hydroxypropanoic acid.
Correct answer: 2-Hydroxy propanoic acid- A. alkane
- B. alcohols
- C. aldehydes
- D. ketones
Explanation: HI with phosphorus is a strong reducing system that removes the carboxyl group of a carboxylic acid and converts the remaining carbon…
Correct answer: alkane- A. formic acid
- B. acetic acid
- C. propionic acid
- D. butyric acid
Explanation: Butyric acid, CH3CH2CH2COOH, has a strong rancid or unpleasant smell and is associated with the odour of rancid butter.
Correct answer: butyric acid- A. C15H31COOH
- B. C13H27COOH
- C. C17H33COOH
- D. C17H35COOH
Explanation: Palmitic acid is a saturated C16 fatty acid, so its formula is C15H31COOH, which contains 16 carbon atoms in total.
Correct answer: C15H31COOH- A. Citric acid
- B. Benzoic acid
- C. Tartaric acid
- D. Oxalic acid
Explanation: Lemon juice contains a high concentration of citric acid, C6H8O7, which gives it its characteristic sour taste.
Correct answer: Citric acid- A. Water
- B. Formic acid
- C. Acetic acid
- D. Propanoic acid
Explanation: Formic acid is the strongest of these weak acids because the alkyl groups in acetic and propanoic acids donate electron density toward the…
Correct answer: Formic acid- A. Lactic acid
- B. Formic acid
- C. Uric acid
- D. Acetic acid
Explanation: Red ants inject formic acid, HCOOH, into the skin, and its acidic action causes the burning irritation.
Correct answer: Formic acid- A. malonic acid
- B. oxalic acid
- C. succinic acid
- D. maleic acid
Explanation: Maleic acid is but-2-enedioic acid, containing a carbon-carbon double bond, so it is an unsaturated dicarboxylic acid.
Correct answer: maleic acid- A. Alkyne
- B. Alkene
- C. Alkane
- D. Alcohol
Explanation: Complete reduction of a carboxylic acid removes the oxygen functionality and gives the corresponding alkane, for example RCOOH -> RCH3…
Correct answer: Alkane- A. Esterification
- B. Decarboxylation
- C. Saponification
- D. Neutralization
Explanation: Esters can be hydrolyzed to form a carboxylate salt and alcohol using KOH and water.
Correct answer: Saponification- A. CH3CI
- B. CH3COCI
- C. CH3COCI2
- D. CH3CH2COCI
Explanation: When PCl5 reacts with acetic acid CH3COOH, an acyl chloride acetyl chloride is formed:CH3COOH + PCl5 CH3COCl +POCl3 +HCl
Correct answer: CH3COCI- A. Raspberry
- B. Pineapple
- C. Jasmine
- D. Apricot
Explanation: Benzyl acetate (C6H5CH2OOCCH3) is an ester that is commonly used as a flavoring and fragrance agent.
Correct answer: Jasmine- A. It forms an acid anhydride
- B. It forms an acyl halide
- C. It does not react due to resonance
- D. It does not react due to bad leaving group
Explanation: When a carboxylic acid reacts with an acyl chloride, it forms an acid anhydride through the elimination of HCl.
Correct answer: It forms an acid anhydride- A. Akinoic acid
- B. Alkanoic acid
- C. Alkenoic acid
- D. Alkyl alkanoate
Explanation: In the IUPAC system, carboxylic acids are also known as alkanoic acids.
Correct answer: Alkanoic acid- A. In the parent name COOH position is not mentioned
- B. COOH is written as substituent and position is mentioned
- C. COOH is given 1st position in all carboxylic acid
- D. Both a and c
Explanation: COOH is given 1st position in all carboxylic acids.
Correct answer: COOH is given 1st position in all carboxylic acid- A. Methanoic
- B. Ethanoic
- C. Propanoic
- D. Butanoic
Explanation: Acetic acid (CH3COOH), also called ethanoic acid, the most important of the carboxylic acids.
Correct answer: Ethanoic- A. 15
- B. 18
- C. 05
- D. 07
Explanation: Stearic acid, with the chemical formula C18H36O2, contains 18 carbon atoms.
Correct answer: 18- A. Butanoic acid
- B. Formic acid
- C. Propionic acid
- D. Acetic acid
Explanation: Butyric acid, also known under the systematic name butanoic acid, is a straight-chain alkyl carboxylic acid with the chemical formula…
Correct answer: Butanoic acid