Experiment #6: Alcohols And Phenols

Question 1

What is the reagent of Lucas Test?

Answer 1

HCl-ZnCl2 Mixture

Question 2

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

Answer 2

c. 6 atoms

Question 3

TRUE OR FALSE:

Alkyl Chlorides are soluble in Lucas Test

Answer 3

FALSE; they are insoluble

Question 4

What is the positive result for Lucas Test?

Answer 4

Appearance of cloudiness because of white precipitate

Question 5

IDENTIFICATION

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

Answer 5

Hydrogen Halide (HX)

Question 6

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

2-butanol, 3-butanol, 1-butanol

Answer 6

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

Question 7

Determine the results of the following compound on Lucas Test:

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

Answer 7

RESULTS:

1. • (negative)
2. • (positive)
3. • (positive)
4. • (negative)

Question 8

What is the observation of phenol on Lucas Test?

Answer 8

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

Question 9

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

Answer 9

Acetyl Chloride Test

Question 10

What is the positive result of Acetyl Chloride Test?

Answer 10

Evolution of Heat and Gas or a Precipitate

Question 11

What is the limitation in Acetyl Chloride Test?

Answer 11

Moisture present in the unknown will give a positive test

Question 12

What is the product of Acetyl Chloride Test?

Answer 12

Ester

Question 13

What is the positive result of Ferric Chloride Test?

Answer 13

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

Question 14

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

1. 1-butanol
2. Phenol

Answer 14

1. • (negative)
2. • (positive)

Question 15

What is the reagent of Ferric Chloride Test?

Answer 15

Ferric Chloride Fe (II)

Question 16

What is the reagent of Bromine in Water Test?

Answer 16

Br2, H2O

Question 17

What is the positive result of Bromine in Water Test?

Answer 17

Disappearance of the orange color

Question 18

What is the product of Bromine in Water Test?

Answer 18

2,4,6 - tribromophenol

Question 19

TRUE OR FALSE:

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

Answer 19

TRUE

Question 20

IDENTIFICATION:

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

Answer 20

Class A2 (Weaker Acid)

Question 21

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

1. KMNO4
2. H2CrO4

Answer 21

1. Black Precipitation
2. Opaque Green

Question 22

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

Answer 22

It will become insoluble

Question 22

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

Answer 22

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

Question 22

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

1. 1-butanol
2. phenol

Answer 22

1. • (negative)
2. • (positive)

Question 23

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

Answer 23

1. + (positive) 2. + (positive) 3. - (negative)

Question 24

**IDENTIFICATION:** Alcohols dissolved in **cold concentrated** ___________

Answer 24

H2SO4

Question 25

# ** **TRUE OR FALSE:** There is no acid catalyst needed in Acetyl Chloride Test

Answer 25

TRUE

Question 26

It identify active hydrogen, alcohol, or phenol

Answer 26

Acetyl Chloride

Question 27

This test only give positive result to phenols only

Answer 27

Ferric Chloride Test

Question 28

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

Answer 28

1. acetyl chloride 2. hydrogen chloride gas