Ultimate Organic Chemistry Quiz

Reviewed by Zohra Sattar
Zohra Sattar, PhD, Chemistry |
Chemistry Expert
Review Board Member
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.
, PhD, Chemistry
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Ultimate Organic Chemistry Quiz - Quiz

Welcome to our engaging Organic Chemistry Quiz, designed to test and refine your understanding of essential concepts in organic chemistry. This interactive quiz covers a wide array of topics from the foundational elements like hydrocarbon structures, isomerism, and functional groups to more complex chemical reactions and mechanisms.

Whether you're a student aiming to ace your exams, a teacher looking for classroom resources, or an enthusiast eager to brush up on your knowledge, this quiz offers a comprehensive challenge that caters to all levels.

Each question is crafted to not only test your factual knowledge but also to enhance your problem-solving skills Read moreand application of organic theory in practical scenarios. Feedback is provided instantly for each question, helping you understand the rationale behind correct answers and learn from any mistakes. Dive into our Organic Chemistry Quiz today and challenge yourself to master the complex and fascinating world of organic molecules!


Organic Chemistry Questions and Answers

  • 1. 

    The boiling point of solutions is the temperature at which the vapor pressure equals the external pressure.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The boiling point of solutions is not solely determined by the vapor pressure equaling the external pressure. The boiling point of a solution is actually higher than the boiling point of the pure solvent due to the presence of solute particles, which disrupt the intermolecular forces and require more energy to break the bonds and convert into vapor. Therefore, the statement is false.

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  • 2. 

    We use vacuum distillation to separate thermolabile liquid compounds at 1atm.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Vacuum distillation is used to separate heat-sensitive or thermolabile liquid compounds at reduced pressure (below atmospheric pressure), not at 1atm. By lowering the pressure, the boiling point of the compounds decreases, allowing for separation without decomposition. Therefore, the given statement is false.

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  • 3. 

    Chloral hydrate is more stable than chloral so we use it in the synthesis of iso nitroso acetanilide.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Chloral hydrate is not more stable than chloral, therefore it is not used in the synthesis of iso nitroso acetanilide.

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  • 4. 

    Acetone can be tested by iodoform test.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Acetone can be tested by the iodoform test because it contains a methyl ketone group. The iodoform test is used to detect the presence of methyl ketones, such as acetone, by reacting them with iodine and a base. This reaction produces a yellow precipitate of iodoform, which confirms the presence of acetone. Therefore, the given statement is true.

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  • 5. 

    What happens to the boiling point of a liquid when a more volatile solute is added to it? 

    • A.

      Decrease

    • B.

      Increase

    • C.

      Doesn't affect

    • D.

      The effect is according to the condition.

    Correct Answer
    A. Decrease
    Explanation
    When a more volatile solute is added to a pure liquid, it decreases the boiling point (BP) of the liquid. This is because the solute molecules disrupt the attractive forces between the liquid molecules, making it easier for the liquid to vaporize and reach its boiling point. As a result, the BP of the pure liquid decreases.

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  • 6. 

    Electron-withdrawing groups in the para position decrease the acidity and nucleophilicity of phenol.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    Electron-withdrawing groups in the para position do not decrease the acidity and nucleophilicity of phenol. In fact, these groups increase the acidity of phenol by stabilizing the negative charge on the oxygen atom. Additionally, electron-withdrawing groups also enhance the nucleophilicity of phenol by making the oxygen atom more electron-deficient. Therefore, the given statement is false.

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  • 7. 

    The reaction between Toluidine+ CCl3CH(OH)2 + NH2OH.HCl produces.

    • A.

      P-iodobenzoic acid

    • B.

      Isonitrosoacetamide

    • C.

      2-hydroxyimino-N-phenyl acetanilide  

    • D.

      2-hydroxyimino-N-Phenylacetamide

    Correct Answer
    D. 2-hydroxyimino-N-Phenylacetamide
    Explanation
    The reaction between Toluidine, CCl3CH(OH)2, and NH2OH.HCl produces 2-hydroxyimino-N-Phenylacetamide.

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  • 8. 

    Chloral hydrate can form two H-bonds but chloral can not .

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Chloral hydrate is a compound that contains a hydroxyl group (-OH) attached to the chloral molecule. This hydroxyl group can form two hydrogen bonds with other molecules or functional groups. On the other hand, chloral does not have a hydroxyl group and therefore cannot form hydrogen bonds. Hence, the statement that chloral hydrate can form two hydrogen bonds while chloral cannot is true.

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  • 9. 

    The Vigreux column is a fractionating column that allows the reasonable separation of compounds with a boiling point difference of 30-40° C.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    The Vigreux column is a type of fractionating column that is designed to improve the separation of compounds with a small boiling point difference. It consists of a series of indentations or "baffles" along the length of the column, which increases the surface area available for vaporization and condensation. This increased surface area allows for more efficient separation of compounds with a boiling point difference of 30-40°C. Therefore, the statement that the Vigreux column allows reasonable separation of compounds with a boiling point difference of 30-40°C is true.

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  • 10. 

    O-nitrophenol and p-nitrophenol can be separated by fractional distillation using a Hempel column.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    O-nitrophenol and p-nitrophenol cannot be separated by fractional distillation using Hempel column because they have very similar boiling points and would not form distinct fractions during the distillation process. Alternative separation techniques such as chromatography or solvent extraction would be more suitable for separating these compounds.

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  • 11. 

    The splash head is used in

    • A.

      Simple distillation

    • B.

      Fractional distillation

    • C.

      Steam distillation

    • D.

      Vacuum distillation

    Correct Answer
    C. Steam distillation
    Explanation
    Steam distillation is a technique used to separate volatile compounds from non-volatile substances. In this process, steam is passed through the mixture, causing the volatile compounds to vaporize. The vapor is then condensed and collected, resulting in the separation of the desired compound. The splash head is a crucial component in steam distillation as it helps in controlling the flow of steam and preventing any splashing or loss of the mixture. Therefore, the splash head is specifically designed for steam distillation, making it the correct answer.

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  • 12. 

    Oxidation of phenols by a strong oxidizing agent produces carboxylic acids.

    • A.

      True

    • B.

      False

    Correct Answer
    B. False
    Explanation
    The statement is false because the oxidation of phenols by a strong oxidizing agent does not produce carboxylic acids. Instead, it produces quinones. Carboxylic acids are typically formed when alcohols are oxidized, not phenols.

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  • 13. 

    Acetone can be tested by iodoform.

    • A.

      True

    • B.

      False

    Correct Answer
    A. True
    Explanation
    Acetone can be tested by iodoform because when acetone reacts with iodine and sodium hydroxide, it forms a yellow precipitate of iodoform. This reaction is a characteristic test for the presence of acetone. Therefore, the statement "Acetone can be tested by iodoform" is true.

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  • 14. 

    A + B → AB  ​​​​​​M.Wt of A= 137.135 g/mol  M.Wt of B= 140.732 g/mol  M.Wt of AB= 248.017  Calculate the theoretical yield if the volume of A= 10 ml, B=25ml, AB= 40 ml  And the density of A=1.5 g/ml,  B= 2 g/ml, AB= 2.3 g/ml ​​​​​​

    • A.

      50.87

    • B.

      88.11

    • C.

      27.03

    • D.

      1.73

    Correct Answer
    C. 27.03
    Explanation
    The theoretical yield can be calculated by first determining the number of moles of A, B, and AB using their respective volumes and densities. Then, using the molar mass of AB, the number of moles of AB can be converted to grams. The theoretical yield is the mass of AB obtained from the reaction. In this case, the theoretical yield is 27.03 grams.

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  • 15. 

    Why is cooling in an ice bath required during the synthesis of p-iodobenzoic acid from p-aminobenzoic acid?

    • A.

      To avoid the decomposition of p-aminobenzoic acid.

    • B.

      To prevent the formation of unwanted by-products.

    • C.

      To control the diazotization reaction and prevent side reactions.

    • D.

      To enhance the solubility of p-aminobenzoic acid in the reaction mixture.

    Correct Answer
    C. To control the diazotization reaction and prevent side reactions.
    Explanation
    Cooling in an ice bath during the synthesis of p-iodobenzoic acid from p-aminobenzoic acid is crucial to control the highly exothermic diazotization reaction. Maintaining a low temperature (0-5°C) stabilizes the intermediate diazonium salt, preventing its decomposition and the formation of unwanted by-products. This ensures a successful Sandmeyer reaction, where the diazonium group is replaced with an iodine atom, yielding p-iodobenzoic acid with minimal side reactions.

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Zohra Sattar |PhD, Chemistry |
Chemistry Expert
Dr. Zohra Sattar Waxali earned her doctorate in chemistry and biochemistry from Northwestern University, specializing in the metallomes of cardiac cells and stem cells, and their impact on biological function. Her research encompasses the development of arsenoplatin chemotherapeutics, stapled peptide estrogen receptor inhibitors, and antimicrobial natural products. With her expertise, Dr. Waxali ensures the accuracy and relevance of our chemistry quizzes, contributing to a comprehensive understanding of chemical principles and advancements in the field.

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Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.

  • Current Version
  • May 10, 2024
    Quiz Edited by
    ProProfs Editorial Team

    Expert Reviewed by
    Zohra Sattar
  • Apr 19, 2023
    Quiz Created by
    Themes
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