Test: Properties of Alcohols - NEET MCQ

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 In this case, the hydrogen in the -COOH group has been replaced by an ethyl group

The correct answer is Option D.

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.

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

The correct option is A

CH₃- OH

Larger the hydrocarbon part in the molecule lesser is the solubility. Since in methanol only CH₃group is attached it is easily soluble.

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.

The correct answer is Option A.

Isopropyl alcohol forms acetone on oxidation. 
 
The reaction is as follows:

In the Fischer-Speier esterification, concentrated sulfuric acid (H₂SO₄) is used as the catalyst for the following reasons:

1. Protonation of Carboxyl Group: H₂SO₄ protonates the carbonyl oxygen of the carboxylic acid, increasing the electrophilicity of the carbonyl carbon, making it more reactive towards alcohol.

2. Water Removal: It acts as a dehydrating agent, absorbing the water produced in the reaction, thereby shifting the equilibrium towards ester formation according to Le Chatelier’s principle.

3. Catalytic Role: H₂SO₄ is not consumed in the reaction, only aiding the esterification process by creating an acidic environment.

Other options like dry HCl, concentrated HNO₃, and pyridine are not typically used in this reaction. HCl is more relevant in other types of reactions, HNO₃ is an oxidizing agent, and pyridine is basic, which is unsuitable for esterification requiring acidic conditions.

Therefore, concentrated sulfuric acid is the ideal catalyst in Fischer-Speier esterification.

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.