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MCQS

UHS MDCAT 2023

Q-117

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<p>Propanone can be prepared from propyne by:</p>

Chemistry

Miscellaneous

Question 117 of 200

Multiple Choice

Passing a mixture of propyne and steam over a catalyst, magnesium at 420°C

10.47%

Explanation:

This option describes the hydration of propyne (also known as propene) to form propanone (acetone) in the presence of a catalyst (magnesium) at elevated temperature. It is a suitable method for preparing propanone.

Passing a mixture of propyne and ethanol over a catalyst, zinc chromate

12.80%

Explanation:

This option does not describe a common method for preparing propanone from propyne. Zinc chromate is not typically used in this reaction.

Boiling propyne with water in the presence of HgSO₄ and H₂SO₄

71.27%

Explanation:

This option describes a hydration reaction in which propyne (propyne) reacts with water (H₂O) in the presence of mercury sulfate (HgSO₄₎ and sulfuric acid (H₂SO₄) to form propanone (acetone). The reaction proceeds through the addition of water across the triple bond in propyne, leading to the formation of propanone.

Treating propyne with iodine and NAOH

5.45%

Explanation:

This option does not describe a method for preparing propanone from propyne. The reaction involving iodine and NaOH is typically used for alkyne identification but not for propanone synthesis.

Explanation

The correct option is C, explanation is already given.