Laboratory Tests: Tollen's Test and Benedict's Test
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Questions and Answers

What color does copper (II) ion turn into after being reduced in the Benedict’s test?

  • Blue
  • Red (correct)
  • Yellow
  • Green

    • What is the purpose of using Benedict’s test in clinical laboratories?

  • To identify the color change of copper ions.
  • To measure the pH of urine.
  • To diagnose protein deficiencies.
  • To test for the presence of reducing agents in urine. (correct)

    • What happens to the aldehyde group in a compound when Benedict’s reagent is added during the Benedict’s test?

  • It is oxidized to the carboxylic ion. (correct)
  • It forms a blue color complex with citrate ions.
  • It remains unchanged.
  • It is reduced to copper (I) oxide.

    • What type of condensation reaction involves the addition of one aldehyde to another with bases as a catalyst?

    <p>Aldol condensation</p> Signup and view all the answers

    What characteristic distinguishes an aldehyde condensation product?

    <p>It has an increased carbon chain.</p> Signup and view all the answers

    In living systems, how are carbohydrates primarily prepared?

    <p>By enzyme-catalyzed aldol condensation reactions.</p> Signup and view all the answers

    What class of compounds contain the carbonyl group?

    <p>Aldehydes and Ketones</p> Signup and view all the answers

    Which compound is an example of an aldehyde?

    <p>Benzaldehyde</p> Signup and view all the answers

    What is the product when primary alcohols are oxidized?

    <p>Aldehydes</p> Signup and view all the answers

    Which type of reaction results in the formation of aldehyde hydrates?

    <p>Addition of water</p> Signup and view all the answers

    What is the product formed when a hemiacetal reacts with excess alcohol?

    <p>Acetal + water</p> Signup and view all the answers

    What is formed when aldehydes react with alcohols in the presence of an acid catalyst?

    <p>Hemiacetals, acetals, hemiketals, and ketals</p> Signup and view all the answers

    Which functional groups are present in a hemiketal?

    <p>Alkoxy and alcohol groups</p> Signup and view all the answers

    What is formed when a ketone reacts with an alcohol?

    <p>Ketal + water</p> Signup and view all the answers

    What products are formed from the reduction of aldehydes and ketones, respectively?

    <p>Primary/Secondary alcohols</p> Signup and view all the answers

    Why are aldehydes easily oxidized compared to ketones?

    <p>Less reactive C-H bond</p> Signup and view all the answers

    What is an important chemical difference between aldehydes and ketones that is used in chemical tests for their distinction?

    <p>Reactivity of the C-H bond</p> Signup and view all the answers

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