MCQEasyJEE 2023Complex Formation & Catalytic Properties

JEE Chemistry 2023 Question with Solution

The water gas on reacting with cobalt as a catalyst forms:

  • A

    Methanoic acid

  • B

    Methanal

  • C

    Ethanol

  • D

    Methanol

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: Water gas is a mixture of COCO and H2H_2.

Find: The product formed on reaction in the presence of catalyst.

Water gas reacts with hydrogen to produce methanol. The reaction given is:

CO+2H2ZnO, Cr2O3, 700KCH3OHCO + 2H_2 \xrightarrow{ZnO,\ Cr_2O_3,\ 700\, \text{K}} CH_3OH

Thus, the product formed is methanol.

Therefore, the correct option is D.

Reaction Identification

Given: Water gas contains COCO and H2H_2.

Find: Which compound is formed from the given reaction.

From the extracted solution, water gas is stated to be a mixture of COCO and H2H_2. On catalytic conversion, these react to form methanol:

CO+2H2ZnO, Cr2O3, 700KCH3OHCO + 2H_2 \xrightarrow{ZnO,\ Cr_2O_3,\ 700\, \text{K}} CH_3OH

So the product is CH3OHCH_3OH, which is methanol.

Hence, the correct answer is D.

Common mistakes

  • Confusing methanol with methanal is a common mistake. They are different compounds: CH3OHCH_3OH is an alcohol, while HCHOHCHO is an aldehyde. Identify the product name from the reaction formula carefully.

  • Assuming water gas itself contains an oxygenated organic compound is incorrect. Water gas is only a mixture of COCO and H2H_2. First identify the reactants correctly, then recall the product formed under catalytic conversion.

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