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Free Carboxylic Acid Derivatives MCQs with Answers

50 Carboxylic Acid Derivatives 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 acid derivatives include acid halides, acid anhydrides, esters and amides, formed by replacing the hydroxyl group of a carboxylic acid. Their nomenclature, structures, preparation, hydrolysis and relative reactivity are linked through nucleophilic acyl substitution, which differs from the nucleophilic addition reactions of aldehydes and ketones.

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50 questions · page 3 of 3

41. Acetic anhydride is obtained from acetyl chloride in the reaction with:

  • A. P2O5
  • B. H2SO4
  • C. +CH3COONa
  • D. CH3COOH

Explanation: Acetyl chloride reacts with sodium acetate to give acetic anhydride.

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Correct answer: +CH3COONa

42. Which one of the following is not derivative of organic acid?

  • A. Ester
  • B. Amide
  • C. Anhydride
  • D. Amine

Explanation: Amines are derivatives of ammonia where H is replaced by one or more alkyl or aryl groups.

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Correct answer: Amine

43. The formula CH3(CH2)14COO- Na represents a member of the class of compounds called :

  • A. Steroids
  • B. Carbohydrates
  • C. Vitamins
  • D. Soap

Explanation: The formula CH3(CH2)14COO-Na represents a soap compound. Soaps are salts of fatty acids and are commonly used for cleaning purposes.

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Correct answer: Soap

44. The formula CH3(CH2)16COO- Na+ represents a member of the class of compounds which are known as:

  • A. Steroids
  • B. Soaps
  • C. Carbohydrates
  • D. Vitamins

Explanation: The formula CH3(CH2)16COO-Na+ represents a compound known as soap.

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Correct answer: Soaps

45. Which is the correct formula for ammonium carbamate?

  • A. H2NCONH2
  • B. NH4COONH4
  • C. H2NCOONH2
  • D. NH2COONH4

Explanation: The formula of ammonium carbamate is NH2COONH4.

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Correct answer: NH2COONH4

46. The hydrolysis of an ester proceeds most slowly under the conditions of:

  • A. high acidity
  • B. high basicity
  • C. neutrality
  • D. high temperature

Explanation: An ester is a compound derived from an oxoacid (organic or inorganic) in which at least one hydroxyl group (−OH) is replaced by an alkoxy…

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Correct answer: neutrality

47. Choose reactants whose reaction product is ester:

  • A. CH3COOH and CH3OCH3
  • B. CH3COOH and C2H5OH
  • C. CH3COOH and CH3CHO
  • D. CH3COOH and CH3COCH3

Explanation: When primary alcohol is treated with a carboxylic acid in the presence of sulphuric acid a compound is formed.

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Correct answer: CH3COOH and C2H5OH

48. The hydrolysis of an ester in presence of an alkali (NaOH) is known as:

  • A. Esterificatoon
  • B. Decarboxylation
  • C. Saponification
  • D. Transesterification

Explanation: Saponification is the process of hydrolyzing an ester in the presence of an alkali, typically sodium hydroxide (NaOH).

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Correct answer: Saponification

49. In conversion of acid halides to Ester, pyridine is used to:

  • A. Stabilize acid halides
  • B. Consume HCl formed in the reaction
  • C. Dehydrate alcohol
  • D. Dehydrogenate acid halides

Explanation: This option is correct. During the reaction of acid halides with alcohols to form esters, hydrogen halide (such as HCl) is released as a…

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Correct answer: Consume HCl formed in the reaction

50. The IUPAC name of formyl chloride is:

  • A. Methanoic acid
  • B. Chloro methane
  • C. Methanoyl chloride
  • D. Chloro methanoate

Explanation: The correct IUPAC name for formyl chloride is Methanoyl chloride. This name indicates that the compound is derived from methane (the…

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Correct answer: Methanoyl chloride
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