Alcohols and Phenols: Properties and Differences
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Questions and Answers

What is the main difference between an alcohol and a phenol?

  • The type of carbon atom bonded to the hydroxyl group
  • The presence of an aromatic ring (correct)
  • The absence of a hydroxyl functional group
  • The acidity of the compound in aqueous solutions

Why are additional tests used to identify alcohols and phenols?

  • Because of their distinct chemical properties
  • Because solubility in water is not a unique characteristic (correct)
  • Because of their varied solubility in water
  • Because of their similar physical properties

What is the purpose of the Lucas test?

  • To identify the type of carbon atom bonded to the hydroxyl group
  • To determine the solubility of the compound in water
  • To determine the acidity of phenol
  • To distinguish between alcohols and phenols (correct)

What is observed in the procedure to determine the physical properties of alcohols and phenols?

<p>Whether the solutions are homogeneous or heterogeneous (D)</p> Signup and view all the answers

Why are different tests used to determine the chemical properties of alcohols and phenols?

<p>Because of the structural variations between alcohols and phenols (D)</p> Signup and view all the answers

What is the purpose of diluting the samples with distilled water in the procedure?

<p>To prepare the solutions for the tests (B)</p> Signup and view all the answers

What is the purpose of adding 2 ml of water to each test tube in the Iodoform test?

<p>To create a homogeneous mixture (A)</p> Signup and view all the answers

What is the function of the Lucas reagent in the Lucas test?

<p>To form a cloudiness in tertiary alcohols (C)</p> Signup and view all the answers

What is the indication of a positive chromic acid test?

<p>The loss of the brown-red color (D)</p> Signup and view all the answers

What is the purpose of warming the test tubes in the Iodoform test?

<p>To increase the reaction rate (A)</p> Signup and view all the answers

What is the purpose of adding 10% NaOH dropwise to each test tube in the Iodoform test?

<p>To create a basic medium for the reaction (D)</p> Signup and view all the answers

What is the indication of a positive Iron(III) chloride test?

<p>A purple color forms (C)</p> Signup and view all the answers

Flashcards

Alcohol vs Phenol

The main difference is the presence of an aromatic ring in phenols.

Tests for Alcohols and Phenols

Additional tests are necessary because solubility in water isn't unique to identify them.

Lucas Test Purpose

The purpose is to distinguish between alcohols and phenols based on reactivity.

Observations in Alcohol Tests

Determining if solutions are homogeneous or heterogeneous helps in identifying properties.

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Chemical Tests for Alcohols and Phenols

Different tests are used due to structural variations between alcohols and phenols.

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Dilution with Distilled Water

Diluting samples prepares the solutions for further testing procedures.

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Iodoform Test Water Addition

Adding water creates a homogeneous mixture needed for the test.

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Lucas Reagent Function

Lucas reagent forms cloudiness in the presence of tertiary alcohols.

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Positive Chromic Acid Test

A positive result shows loss of brown-red color, indicating oxidation.

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Warming in Iodoform Test

Warming increases the reaction rate for the test to proceed effectively.

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NaOH in Iodoform Test

10% NaOH is added dropwise to create a basic medium for the reaction.

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Positive Iron(III) Chloride Test

A positive test shows purple color formation, indicating phenolic compounds.

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