Alcohol, Phenol and Ether Test

Result

Alcohol, Phenol and Ether Test - 14

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Weekly Quiz Competition

Question 1
1 / -0

Phenol is acidic due to resonance stabilization of its conjugate base :

A
O-H

B
Benzyl alcohol

C
Alkoxide ion

D
Phenoxide ion
Question 2
1 / -0

One of the constituents of baking powder is sodium hydrogencarbonate, the other constituent is

A
hydrochloric acid

B
tartaric acid

C
acetic acid

D
sulphuric acid

Solution

Baking powder is a mixture of baking soda NaHCO₃,(sodium hydrogen carbonate)and a mild edible acid such as tartaric acid. When baking powder mixes with water (form a king cake or bread), sodium hydrogen carbonate reacts with tartaric acid to evolve carbon dioxide gas.
Question 3
1 / -0

Identify the alcohol or phenol having a stronger acidic nature from the following.

A
CH₃CH₂OH

B
C₆H₅OH

C
CH₃CHOHCH₂CH₃

D
CH₃CH₂CH₂CH₂OH
Question 4
1 / -0

What is the major product of following reaction
:

A
p-bromophenol

B
2,4,6-Tribromophenol

C
m-Bromophenol

D
Bromobenzene

Solution

The correct answer is option A
Question 5
1 / -0

IUPAC name of m-cresol is ___________.

A
3-methylphenol

B
3-chlorophenol

C
3-methoxyphenol

D
benzene-1,3-diol

Solution

The correct answer is Option A.
Its IUPAC name is 3-methyl phenol.
Question 6
1 / -0

Phenol on treatment with Phthalic anhydride gives:

A
Phenolphthalein

B
Salicylaldehyde

C
Phthalic acid

D
Salicylic acid

Solution

The correct answer is option A
Phenolphthalein gives pink colour with alkali.
Question 7
1 / -0

We can obtain picric acid from phenol by:

A
Sulphonation of phenol

B
By Reimer Tiemann reaction

C
Nitration of phenol

D
Halogenation of phenol

Solution

The correct answer is option C
Phenol heated with sulphuric acid gives phenol disulphonic acid, which further on reaction with nitric acid forms picric acid (2,4,6-trinitrophenol).
Question 8
1 / -0

The acidity of phenols is due to

A
Oxidation process

B
Resonance stabilization of its ions.

C
Hybridisation

D
Presence of O-H group

Solution

The -OH group is attached to more electronegative sp²hybridized carbon atom which decreases the electron density on oxygen and increases the polarity of O-H bond. This increases the ionization of phenol. Moreover, in the phenoxide ion, the negative charge is delocalized over ortho and para positions. Hence, phenoxide ion is more stable than phenol. This increases the acidity of phenol.
Question 9
1 / -0

Which of the following is obtained as a major product in Friedel-Craft’s alkylation of phenol ?

A

B

C

D

Solution

The correct answer is option A
P-methyl phenol is the major product.
Question 10
1 / -0

Phenols do not respond to which of these tests?

A
Schiff’s reagent test

B
FeCl₃ test

C
Br₂ water test

D
Litmus test

Solution

Phenols respond to all the above mentioned tests except Schiff’s reagent test, which is shown by aldehydes.