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 In this case, the hydrogen in the -COOH group has been replaced by an ethyl group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

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:

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.

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.