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JEE Main · 2021 · 24 Feb 2021 · Shift 1 · Hydrocarbons

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Which of the following reagent is used for the following reaction ?

  1. (A)Potassium permanganate
  2. (B)Molybdenum oxide✓ Correct
  3. (C)Copper at high temperature and pressure
  4. (D)Manganese acetate

Answer: (B)

Solution

The conversion of propane to propanal (propionaldehyde) is a selective oxidation reaction. This reaction is catalyzed by molybdenum oxide (Mo₂O₃) or molybdenum trioxide (MoO₃).

The reaction is:


Molybdenum oxide acts as a catalyst for the controlled oxidation of the terminal methyl group to an aldehyde group. This is an industrial process for producing aldehydes from alkanes.

Potassium permanganate would oxidize the alkane too strongly, leading to carboxylic acids or complete oxidation. Copper and manganese acetate are not suitable catalysts for this specific transformation.

JEE Main · 2021 · 24 Feb 2021 · Shift 1 · Single correct option

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