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 20 of 28
- A. CO2
- B. NO
- C. SO2
- D. SO3
Explanation: Reactions with PCI5 and SOCI2: In this reaction SO2 is released which is in gaseous state at room temperature.
Correct answer: SO2- A. Displacement of the -H from the acid by-Cl
- B. Displacement of the -OH from the acid by -NH2
- C. Attachment of -NH2 with the carbonyl oxygen
- D. Displacement of the -H from the acid by -NH2
Explanation: Carboxylic acids react with ammonia to form ammonium salts which on heating produce acid amides.
Correct answer: Displacement of the -OH from the acid by -NH2- A. Esterification
- B. Acid Halide formation
- C. Acid Amide formation
- D. Acid anhydride formation
Explanation: Among the options given, the only reversible reaction involving carboxylic acids is A) Esterification, where carboxylic acids and alcohols…
Correct answer: Esterification- A. 1
- B. 3
- C. 2
- D. 4
Explanation: Option A is correct. Ca exists in the free form as Ca+2 so on reaction it has tendency to give two electrons to make two bonds.Since 2…
Correct answer: 1- A. Acyl halide
- B. Acid anhydride
- C. Acid amide
- D. Ester
Explanation: Option C is correct.Acid amides are the least reactive carboxylic acid derivatives.
Correct answer: Acid amide- A. CH3COCI + H3PO3
- B. CH3CI + POCI3 + HCI
- C. CH3COCI + POCl2 + HCl
- D. CH3COCI + POCI3 + H2
Explanation: By using PCl3 as the chlorinating reagent, various carboxylic acids are converted into the corresponding acid chlorides in good yields.
Correct answer: CH3COCI + H3PO3- A. Alkenes
- B. Alkyl halides
- C. Alkynes
- D. Ketones
Explanation: Aldehydes are obtained by the oxidation of primary alcohols whereas Ketones by the oxidation of secondary alcohols.Ketones are also…
Correct answer: Ketones- A. Acetic acid
- B. Propanoic acid
- C. Formic acid
- D. Butanoic acid
Explanation: The other options (a, b, and d) do not directly result from the hydrolysis of methyl cyanide.
Correct answer: Formic acid- A. Oxalic acid
- B. Formic acid
- C. Ethanoic acid
- D. Propanoic acid
Explanation: Formic acid is a monoaliphathic carboxylic acid.It forms formamide(formamide is a monoacidamide) on reaction with ammonia.
Correct answer: Formic acid- A. CH3COCI
- B. CH2ClCOCI2
- C. CH3COCH2CI2
- D. CH2COCl2
Explanation: The carboxylic acid reacts with SOCl2 to form acid chloride. In the reaction, the hydroxyl group of the carboxylic acid is converted to an…
Correct answer: CH3COCI- A. Ketone
- B. Aldehyde
- C. Alcohol
- D. Carboxylic acid
Explanation: Hydrolysis of an alkanenitrile on boiling with mineral acids or alkalis yields corresponding carboxylic acid.It may be noted that acid…
Correct answer: Carboxylic acid- A. Methyl acetate
- B. Propanal
- C. Ethyl acetate
- D. Propanone
Explanation: Ester is the only functional isomer of carboxylic acid.Propionic acid and methyl acetate both have same molecular formula (C3 H6 O2 ) but…
Correct answer: Methyl acetate- A. OR+
- B. R+
- C. R
- D. OR
Explanation: Option D is the correct answer. In esterification, the hydroxyl group (OH) of a carboxylic acid is replaced by an alkyl or aryl group (R)…
Correct answer: OR- A. Propionic acid
- B. 1-propionic acid
- C. 1-propanoic acid
- D. propanoic acid
Explanation: Option D is the correct IUPAC name for CH3CH2COOH. In the IUPAC nomenclature system, the name "propanoic acid" is used to describe…
Correct answer: propanoic acid- A. OH-
- B. OH+
- C. H3O+
- D. H2O
Explanation: In esterification, the hydroxyl group (OH) of the carboxylic acid departs as a water molecule (H2O).
Correct answer: H2O- A. Blue
- B. Violet
- C. Bluish violet
- D. Red
Explanation: Bluish violet is correct because when ninhydrin reacts with amino acids, it forms a product known as Ruhemann's purple, which appears as a…
Correct answer: Bluish violet- A. Benzyl acetate
- B. Iso-butyl formate
- C. Octyl acetate
- D. Ethyl butyrate
Explanation: Octyl acetate is correct because it is commonly found in oranges and contributes to their flavor and aroma.
Correct answer: Octyl acetate- A. Formic acid
- B. Acetic acid
- C. Carbonic acid
- D. Benzoic acid
Explanation: Acetic acid is used in the manufacture of synthetic fibers, particularly cellulose acetate fibers, through processes like acetylation…
Correct answer: Acetic acid- A. α-amino acid
- B. β-amino acid
- C. γ-amino acid
- D. All of the above
Explanation: α-amino acids are indeed the final products of the hydrolysis of peptides and proteins.
Correct answer: α-amino acid- A. Oxonium ion
- B. Carbonium ion
- C. Zwitter ion
- D. Carbanion
Explanation: Zwitterion is correct because in an amino acid, the proton is transferred from the carboxyl group (-COOH) to the amino group (-NH2)…
Correct answer: Zwitter ion