NVAMediumJEE 2023Reaction Mechanisms (Substitution, Addition, Elimination)

JEE Chemistry 2023 Question with Solution

The compound shown below undergoes the following reactions:

Reaction scheme of a bromo ketone substrate treated with Mg followed by H2O to give product A, along with four candidate product structures labeled 1 to 4.

Answer

Correct answer:4

Step-by-step solution

Standard Method

Given: The substrate shown reacts with Mg\text{Mg} followed by H2O\text{H}_2\text{O}.

Find: The major product AA and hence the numerical answer.

The solution concludes that the major product is option 44.

Using the conclusion from the solution:

Major product=option 4\text{Major product} = \text{option } 4

Therefore, the correct numerical answer is 44.

What the solution states

The extracted the solution describes formation of a Grignard reagent on treatment with Mg\text{Mg} in dry ether and then states that the major product corresponds to option 44 after reaction with water.

It ends with:

4\boxed{4}

So the answer to be entered is 44.

Common mistakes

  • Assuming this is a direct substitution by OH\text{OH}^-. That is not what the given reagent sequence indicates. First identify the role of Mg\text{Mg}, then use the product conclusion from the solution.

  • Ignoring the numbering instruction in a numerical-value question. Here the required response is the option number as a numeral, so the answer must be entered as 44, not as a structure description.

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