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Organic Chemistry LAB > Experiment #6: Alcohols And Phenols > Flashcards

Experiment #6: Alcohols And Phenols Flashcards

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1
Q

What is the reagent of Lucas Test?

A

HCl-ZnCl2 Mixture

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2
Q

MULTIPLE CHOICE:

Alcohols of no more than ______ C atoms are soluble in Lucas Reagent.

a. 5 atoms
b. 7 atoms
c. 6 atoms
d. 9 atoms

A

c. 6 atoms

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3
Q

TRUE OR FALSE:

Alkyl Chlorides are soluble in Lucas Test

A

FALSE; they are insoluble

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4
Q

What is the positive result for Lucas Test?

A

Appearance of cloudiness because of white precipitate

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5
Q

IDENTIFICATION

In the presence of _____________, it can convert alcohol to alkyl halides

A

Hydrogen Halide (HX)

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6
Q

Arrange the increasing order of the compound based on their reactivity:

2-butanol, 3-butanol, 1-butanol

A

3-butanol<2-butanol<1-butanol

TAKE NOTE:

Tertiary Alcohols: Fast Reaction
Secondary Alcohols: Reaction after several minutes (would take some time)
Primary Alcohols: Only upon heating

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7
Q

Determine the results of the following compound on Lucas Test:

  1. 1-butanol
  2. 2-butanol
  3. tert-butanol
  4. phenol
A

RESULTS:

    • (negative)
    • (positive)
    • (positive)
    • (negative)
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8
Q

What is the observation of phenol on Lucas Test?

A

Immiscible; the upper layer has brown and the bottom is clear

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9
Q

It is the reaction between Acetyl Chloride and a compound X-O-H (where X - hydrogen, alkyl group, or benzene ring)

A

Acetyl Chloride Test

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10
Q

What is the positive result of Acetyl Chloride Test?

A

Evolution of Heat and Gas or a Precipitate

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11
Q

What is the limitation in Acetyl Chloride Test?

A

Moisture present in the unknown will give a positive test

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12
Q

What is the product of Acetyl Chloride Test?

A

Ester

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13
Q

What is the positive result of Ferric Chloride Test?

A

Formation of colored complex (usually purple, red, blue, green, reddish brown, violet)

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14
Q

Determine the results of the following compounds on Ferric Chloride Test?

  1. 1-butanol
  2. Phenol
A
    • (negative)
    • (positive)
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15
Q

What is the reagent of Ferric Chloride Test?

A

Ferric Chloride Fe (II)

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16
Q

What is the reagent of Bromine in Water Test?

A

Br2, H2O

17
Q

What is the positive result of Bromine in Water Test?

A

Disappearance of the orange color

18
Q

What is the product of Bromine in Water Test?

A

2,4,6 - tribromophenol

19
Q

TRUE OR FALSE:

The orange color disappeared in Bromine in Water Test because of tribromophenol

A

TRUE

20
Q

IDENTIFICATION:

Phenols are soluble in 5% NaOH solution but NOT in 5% NaHCO3, classifying it as __________?

A

Class A2 (Weaker Acid)

21
Q

What is the colors of the precipitations formed when phenols got oxidized with the following reagents?

  1. KMNO4
  2. H2CrO4
A
  1. Black Precipitation
  2. Opaque Green
22
Q

When testing with Lucas Test, what will happen in the compound of more than 6 carbon atoms?

A

It will become insoluble (and automatic positive)

22
Q

In the positive result of Ferric Chloride Test, why its color is violet?

A

Because of conjugated bonds, (8 or more carbon atoms)

22
Q

Determine the results of the following compounds on Bromine in Water Test?

  1. 1-butanol
  2. phenol
A
    • (negative)
    • (positive)
23
Q

In the Tandem Test in Classifying Alcohols, what is results of alchols when it became oxidized?

  1. Primary Alcohol
  2. Secondary Alcohol
  3. Tertiary Alcohol
A
    • (positive)
    • (positive)
    • (negative)
24
Q

IDENTIFICATION:

Alcohols dissolved in cold concentrated ___________

A

H2SO4

25
Q

**

TRUE OR FALSE:

There is no acid catalyst needed in Acetyl Chloride Test

A

TRUE

26
Q

It identify active hydrogen, alcohol, or phenol

A

Acetyl Chloride

27
Q

This test only give positive result to phenols only

A

Ferric Chloride Test

28
Q

With Acetyl Chloride Test, alcohols react with ________ to form esters and gives out ________________

A
  1. acetyl chloride
  2. hydrogen chloride gas

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