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All questions of Alkanoate for JAMB Exam

Alkanoates are formed by the reaction between:
  • a)
    Alkanoic acids and alkanols
  • b)
    Alkenes and carboxylic acids
  • c)
    Alkanes and alcohols
  • d)
    Aldehydes and ketones
Correct answer is option 'A'. Can you explain this answer?

Deepak Iyer answered
Alkanoates are esters formed by the reaction between alkanoic acids and alkanols in a process called esterification. During esterification, the carboxylic acid group (-COOH) of the alkanoic acid reacts with the hydroxyl group (-OH) of the alkanol, resulting in the formation of an ester and water.
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Saponification is the process of:
  • a)
    Producing alkanoates from alkanoic acids
  • b)
    Producing alkanoic acids from alkanoates
  • c)
    Producing soaps from alkanoates
  • d)
    Producing alkanoates from alkanes
Correct answer is option 'C'. Can you explain this answer?

Deepak Iyer answered
Saponification is the hydrolysis of esters, specifically alkanoates, in the presence of a strong base, such as sodium hydroxide or potassium hydroxide. This process produces the corresponding alkanoic acid salts, known as soaps, along with glycerol.

Margarine is produced through the process of:
  • a)
    Saponification
  • b)
    Esterification
  • c)
    Polymerization
  • d)
    Oxidation
Correct answer is option 'B'. Can you explain this answer?

Deepak Iyer answered
Margarine is produced through the process of esterification. It involves the reaction between unsaturated fatty acids (often derived from vegetable oils) and an alcohol, such as glycerol, to form esters. The esters give margarine its solid consistency at room temperature.

Which of the following is an example of an alkanoate?
  • a)
    Ethanol
  • b)
    Methane
  • c)
    Ethanoic acid
  • d)
    Ethyl ethanoate
Correct answer is option 'D'. Can you explain this answer?

Deepak Iyer answered
Ethyl ethanoate is an example of an alkanoate. It is formed by the reaction between ethanoic acid (an alkanoic acid) and ethanol (an alkanol) through esterification.

Soaps are primarily made up of:
  • a)
    Sodium or potassium salts of fatty acids
  • b)
    Sodium chloride
  • c)
    Sodium hydroxide
  • d)
    Sodium carbonate
Correct answer is option 'A'. Can you explain this answer?

Deepak Iyer answered
Soaps are primarily made up of sodium or potassium salts of fatty acids. These salts are formed during the saponification process when the alkanoates (fatty acid salts) react with a strong base, such as sodium hydroxide or potassium hydroxide.

Fats and oils are examples of:
  • a)
    Alkanes
  • b)
    Alkenes
  • c)
    Alkanoates
  • d)
    Alcohols
Correct answer is option 'C'. Can you explain this answer?

Deepak Iyer answered
Fats and oils are triglycerides, which are esters of fatty acids (alkanoic acids) and glycerol (an alkanol). Therefore, they are examples of alkanoates.

Alkanoates have the general formula:
  • a)
    RCOOH
  • b)
    RCOO-
  • c)
    RCOOR'
  • d)
    R-OH
Correct answer is option 'C'. Can you explain this answer?

Deepak Iyer answered
Alkanoates have the general formula RCOOR', where R and R' represent alkyl or aryl groups. The R group is derived from the alkanoic acid, while the R' group is derived from the alkanol during esterification. The -COO- group in the alkanoate represents the ester functional group.

Which substance is commonly used as a raw material for producing soap?
  • a)
    Ethanol
  • b)
    Glycerol
  • c)
    Ethanoic acid
  • d)
    Methanol
Correct answer is option 'B'. Can you explain this answer?

Deepak Iyer answered
Glycerol, also known as glycerin, is commonly used as a raw material for producing soap. During the saponification process, glycerol is released as a by-product, while the esters (alkanoates) present in fats or oils react with the strong base to form soap molecules.

Distinction between detergents and soaps can be made based on:
  • a)
    Their physical appearance
  • b)
    Their chemical composition
  • c)
    Their smell
  • d)
    Their origin
Correct answer is option 'B'. Can you explain this answer?

Deepak Iyer answered
The distinction between detergents and soaps is primarily based on their chemical composition. Soaps are typically made from natural fatty acids, while detergents are synthetic compounds. The chemical composition affects their properties, such as solubility, foaming ability, and effectiveness in hard water.

Detergents are different from soaps because detergents:
  • a)
    Are synthetic compounds
  • b)
    Are derived from natural sources
  • c)
    Are always in solid form
  • d)
    Have a higher pH
Correct answer is option 'A'. Can you explain this answer?

Deepak Iyer answered
Detergents are different from soaps because they are synthetic compounds. They are often derived from petroleum or other sources and are designed to have specific properties for cleaning purposes. Detergents can be formulated to be effective in both soft and hard water, have better solubility, and provide enhanced cleaning action compared to soaps.

Chapter doubts & questions for Alkanoate - Chemistry for JAMB 2025 is part of JAMB exam preparation. The chapters have been prepared according to the JAMB exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for JAMB 2025 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.

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