Chemistry Chapter on Alcohols and Phenols
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Questions and Answers

What does the lack of a color change in litmus paper indicate about Alcohol A and the unknown alcohol?

  • The unknown alcohol is neutral
  • Alcohol A is a strong base
  • Both are weak acids or bases (correct)
  • Both are strong acids

    • What characteristic of the unknown alcohol may contribute to its insolubility in water?

  • High polarity of the -OH group
  • Presence of multiple hydroxyl groups
  • Presence of multiple carbon atoms (correct)
  • A low molecular weight

    • Which effect does the hydroxyl (-OH) group typically have on alcohol solubility?

  • It provides hydrophilic characteristics (correct)
  • It makes alcohols viscous
  • It decreases solubility in polar solvents
  • It increases solubility in non-polar solvents

    • How do strong acids interact with blue litmus paper?

    <p>It turns red</p> Signup and view all the answers

    What conclusion can be drawn about the acidity or basicity of the unknown alcohol based on litmus paper testing?

    <p>It is either a weak acid or a weak base</p> Signup and view all the answers

    What is the result of adding hydrochloric acid (HCl) to sodium phenoxide?

    <p>It causes more phenol to form.</p> Signup and view all the answers

    Which of the following reactions shows the formation of phenol from sodium phenoxide?

    <p>C6H5Na + HCl = NaCl + C6H5OH</p> Signup and view all the answers

    What is observed when iron (III) chloride is added to phenol?

    <p>An opaque white color turns violet.</p> Signup and view all the answers

    What inference can be made from the purple color change after adding iron (III) chloride to phenol?

    <p>Ferric phenol complex is produced.</p> Signup and view all the answers

    What happens to the concentration of sodium phenoxide in the presence of HCl?

    <p>It decreases as phenol is formed.</p> Signup and view all the answers

    Which chemical compound is obtained from the reaction of sodium phenoxide with hydrochloric acid?

    <p>Sodium chloride</p> Signup and view all the answers

    The final color observed after the iron (III) chloride test with phenol indicates what specific presence?

    <p>Presence of phenol</p> Signup and view all the answers

    What chemical formula represents the complex formed when phenol reacts with iron (III) chloride?

    <p>C6H5OFe12</p> Signup and view all the answers

    What indicates that alcohol B is a secondary alcohol during the Iodoform test?

    <p>A color change from brown to light yellow</p> Signup and view all the answers

    What was the outcome when alcohols A and B were combined with the oxidizing agent?

    <p>Two distinct layers formed with an opaque top layer.</p> Signup and view all the answers

    Which of the following describes the initial color of the iodine solution before the test is performed?

    <p>Dark brown</p> Signup and view all the answers

    What happens after the addition of 5 drops of ethanol into one of the test tubes?

    <p>It forms an opaque yellow color</p> Signup and view all the answers

    What was observed when the unknown alcohol was tested with the oxidizing agent?

    <p>There was no observable reaction.</p> Signup and view all the answers

    What is the final color change observed in tube containing 2-methyl butan-2-ol during the Iodoform test?

    <p>From dark brown to opaque yellow</p> Signup and view all the answers

    What is the significance of the two distinct layers formed with the alcohols A and B?

    <p>It helps identify the alcohols as likely primary or secondary.</p> Signup and view all the answers

    What role does NaOH play in the Iodoform test?

    <p>It serves as a reagent to promote a color change</p> Signup and view all the answers

    Which temperature range was recommended for warming the test tubes in the water bath?

    <p>40 - 50°C</p> Signup and view all the answers

    What color change was specifically observed for alcohol labeled B?

    <p>It changed from dark green to a lighter shade.</p> Signup and view all the answers

    Which alcohol is specifically identified as ethanol during the iodoform test?

    <p>A secondary alcohol</p> Signup and view all the answers

    How is the presence of a methyl group significant in identifying alcohol B?

    <p>It confirms that alcohol B is likely a secondary alcohol</p> Signup and view all the answers

    What type of test is the Triodomethane (Iodoform) test primarily used to identify?

    <p>Secondary alcohols that contain a methyl group</p> Signup and view all the answers

    What can be inferred if no residue is found after burning alcohol in a crucible?

    <p>Complete combustion has occurred.</p> Signup and view all the answers

    What does the presence of a large orange flame and black smoke indicate during combustion?

    <p>Insufficient oxygen for combustion.</p> Signup and view all the answers

    Which of the following is the balanced equation for the combustion of butanol?

    <p>2C4H10 (l) + 13O2 (g) → 8 CO2 (g) + 10H2O (g)</p> Signup and view all the answers

    What is the significance of observing a small orange flame and no residue during the ignition of alcohol?

    <p>It suggests that high temperatures were achieved.</p> Signup and view all the answers

    What might be indicated by the presence of black or brown residue after burning a fuel?

    <p>Incomplete combustion due to lack of oxygen.</p> Signup and view all the answers

    Which observation is likely to indicate that a combustion reaction is not efficient?

    <p>A bright yellow flame.</p> Signup and view all the answers

    If a fuel produces only carbon dioxide and water upon combustion, what can be concluded?

    <p>Complete combustion occurred.</p> Signup and view all the answers

    Which statement best explains why black smoke is produced during combustion?

    <p>The fuel is burning at a low temperature.</p> Signup and view all the answers

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