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Which of the following reagents can be used to convert 1-pentyne into a ketone? O 1.9-BBN 2. NaOH, H2O2 1.BH3-THF 2. NaOH, H202 O H2SO4, H20, HgSO4 1. Disiamylborane 2. NaOH, H202

2 Answers

5 votes

Final answer:

The reagent that can be used to convert 1-pentyne into a ketone is 2. NaOH, H2O2.

Step-by-step explanation:

The reagent that can be used to convert 1-pentyne into a ketone is 2. NaOH, H2O2.

In this reaction, sodium hydroxide (NaOH) and hydrogen peroxide (H2O2) are used as oxidizing agents to convert the alkyne (1-pentyne) into a ketone.

User Monika Sulik
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8.3k points
1 vote

The reagent combination that can be used to convert 1-pentyne into a ketone is
\(H_2SO_4, H_2O, HgSO_4\). Option 4.

The conversion of 1-pentyne into a ketone involves multiple steps. Let's evaluate the provided reagents:

1.
\(1.9\text{-BBN}\) - This is a boron-based reducing agent and is not typically used to convert alkynes into ketones. It is more commonly employed for reduction reactions.

2.
\(NaOH, H_2O_2\) - This is a reagent combination that can be used for oxidative cleavage of alkynes. In the case of 1-pentyne, it would result in the formation of carboxylic acids, not a ketone.

3.
\(BH_3\text{-THF}, NaOH, H_2O_2\) - This combination involves hydroboration-oxidation. It is known to convert alkynes into aldehydes, not ketones.

4.
\(H_2SO_4, H_2O, HgSO_4\) - This combination is commonly used for the hydration of alkynes, resulting in the formation of ketones.

5.
\(Disiamylborane, NaOH, H_2O_2\) - Similar to option 3, this combination involves hydroboration-oxidation, leading to the formation of aldehydes, not ketones.

Therefore, the reagent combination that can be used to convert 1-pentyne into a ketone is
\(H_2SO_4, H_2O, HgSO_4\) (option 4).

User FObersteiner
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