Read the passage carefully and answer the Questions.

Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms. They play a pivotal role in various biochemical processes of life. Their presence in nature adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the C-OH bond and the O-H bond along with the reactions involving the complete -COOH group.

Propyne on hydration in presence of mercury ions produce

Acetone

The correct answer is Option (1) → Acetone

Hydration of terminal alkynes in presence of $\text{Hg}^{2+} / \text{H}_2\text{SO}_4$ follows Markovnikov addition.

Propyne undergoes hydration to form an enol intermediate which rearranges to a ketone via keto–enol tautomerism.

Detailed Option-wise Explanation

Propyne: $\text{CH}_3\text{—C}\equiv\text{CH}$

On hydration ($\text{Hg}^{2+} / \text{H}_2\text{SO}_4$):

Water adds in Markovnikov manner $\rightarrow$ $\text{OH}$ attaches to middle carbon

Enol formed $\rightarrow$ tautomerises to ketone

Final product formed = Acetone

Hence, Option 1: Acetone = Product of hydration of propyne is correct.