Alcohol, Phenol and Ether Test

Result

Alcohol, Phenol and Ether Test - 16

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following reacts with alcohols to form esters besides carboxylic acids?

A
Aldehydes

B
Amines

C
Ethers

D
Acyl chloride

Solution

The correct answer is option D
Acyl chloride
Esters are derived from carboxylic acids. A carboxylic acid contains the -COOH group, and in an ester the hydrogen in this group is replaced by a hydrocarbon group of some kind. We shall just be
looking at cases where it is replaced by an alkyl group, but it could equally well be an aryl group (one based on a benzene ring).
A common ester - ethyl ethanoate
The most commonly discussed ester is ethyl ethanoate. In this case, the hydrogen in the -COOH group has been replaced by an ethyl group
Question 2
1 / -0

What happens when phenol is treated with ammonia in the presence of anhydrous ZnCl₂?

A
Alkane is formed

B
Esters are formed

C
Alkyl halide is formed

D
Aniline is formed

Solution

The correct answer is Option D.
Question 3
1 / -0

When aryl halide is heated with 6-8% NaOH solution ,at 623 K under 300 atm pressure we get:

A
Phenol

B
Benzyl ether

C
Ethyl alcohol

D
Cumene

Solution

The correct answer is Option A.

The aryl halide is heated with 6-8%. NaOH solution at 623K under 300 atm pressure 1) it gives sodium phenoxide 2) sodium phenoxide treated with HCl(acidification) then it gives phenol.
Question 4
1 / -0

Which alkene is obtained on dehydration of the following alcohol in the presence of H₂SO₄ ?

A

B

C

D
None of the above

Solution

Carbonium ion formed in 1^st step undergoes rearrangement to give tert. carbonium ion since tert-carbonium ions are more stable than secondary one.
Question 5
1 / -0

What is the product formed when excess of ethanol reacts with concentrated sulphuric acid at 383 K and then the temperature of reaction mixture is increased to 443 K?

A
Ethene

B
Ethyl hydrogen sulphate

C
Ethyl chloride

D
Ethoxy ethane

Solution
Question 6
1 / -0

Identify the alcohol or phenol from the following which is most soluble in water.

A
CH₃– OH

B
CH(CH₃)₂ CH₂O-H

C
CH₃(CH₂)₂CH₂OH

D
C₆H₅OH

Solution

The correct answer is option A
Amongst isomeric alcohols, the solubility increases with branching. This is due to the reason that as the branching increases, the surface area of the non-polar hydrocarbon and the solubility increases.
Question 7
1 / -0

Which of the following statement is correct?

A
The -OH group in phenol is meta directing.

B
The electron releasing groups increase the acidic character of phenols.

C
Phenols are less acidic than aromatic alcohols.

D
Boiling point of phenol is higher than that of toluene of comparable molecular mass.

Solution

The correct answer is Option D.
Phenols have higher boiling point than toluene due to the presence of intermolecular hydrogen bonding in phenols. The formation of hydrogen bonds increases the intermolecular force of attraction between the phenol molecules and thereby increases its boiling point.
Question 8
1 / -0

Isopropyl alcohol on oxidation forms:

A
Acetone

B
Ether

C
Acetaldehyde

D
Methane

Solution

The correct answer is Option A.
Isopropyl alcohol forms acetone on oxidation.

The reaction is as follows:
Question 9
1 / -0

Which catalyst is used in Fischer-Speier esterification?

A
Concentrated H₂SO₄

B
Dry HCl gas

C
Concentrated HNO₃

D
Pyridine
Solution
Fischer Esterification is an organic reaction that is employed to convert carboxylic acids in the presence of excess alcohol and a strong acid catalyst to give an ester as the final product. This ester is formed along with water.
The esterification of Fischer is one of the most common carboxylic acid reactions. Treatment with alcohol of carboxylic acids in the presence of acid catalyst contributes to the formation of esters along with the removal of a water molecule.
Fischer esterification uses sulphuric acid as a catalyst. It protonates the carboxylic acid carbonyl group and not the feature of hydroxyl.
Question 10
1 / -0

Fermentation of Glucose to alcohol undergoes in presence of :

A
ZnO

B
Cr₂O₃

C
Invertase

D
Zymase

Solution

The correct answer is option D
Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts. Zymase activity varies among yeast strains. Zymase is also the brand name of the drug pancrelipase.