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JEE Chemistry 2025 Question with Solution

The structure of the major product formed in the following reaction is:

Reaction scheme showing an aryl iodide and bromide substituted aromatic compound reacting with AgCN to give the major product structure.
  • A
    Option 1 product structure diagram is required to identify the substituted aromatic cyanide isomer, but no option image token was supplied.
  • B
    Option 2 product structure diagram is required to identify the substituted aromatic cyanide isomer, but no option image token was supplied.
  • C
    Option 3 product structure diagram is required to identify the substituted aromatic cyanide isomer, but no option image token was supplied.
  • D
    Option 4 product structure diagram is required to identify the substituted aromatic cyanide isomer, but no option image token was supplied.

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: An aromatic halide substrate is treated with AgCN\text{AgCN}.

Find: The structure of the major product.

In the given reaction, the halide Br\text{Br} group reacts with AgCN\text{AgCN}, replacing the bromine atom with the cyanide group via nucleophilic substitution.

This substitution results in the formation of the major product where the cyanide group NC\text{NC} is attached to the benzene ring in place of the bromine atom.

Therefore, the correct option is D. The source solution also states Option (4) as the final answer.

Hint-Based Explanation

Given: The reagent used is AgCN\text{AgCN}.

Find: Which product structure is formed as the major product.

Nucleophilic substitution reactions with AgCN\text{AgCN} typically result in replacement of a halide by the cyanide functionality. Based on the extracted solution, the group replacing Br\text{Br} is written as NC\text{NC} in the product description.

Hence, among the four structures, the correct choice is Option D.

Use the Solution Conclusion

Given: The extracted solution explicitly concludes the answer.

Find: The correct option.

The primary solution states "The Correct Option is D" and "Final Answer: Option (4)". Since the second provided approach is unrelated to this question, it is ignored.

Therefore, the correct option is D.

Common mistakes

  • Students may assume the unrelated second solution is valid for this question. That is incorrect because it discusses H2\text{H}_2, I2\text{I}_2, and equilibrium graphs, which do not match the organic reaction shown. Use only the relevant reaction-based solution.

  • A common mistake is to treat the answer as a numerical value because the options were not scraped. This is incorrect because the solution explicitly says "The Correct Option is D" and "Option (4)", so the question is an MCQ, not NVA.

  • Students may guess the product structure without tracking which halide is replaced. The extracted solution specifically states that Br\text{Br} is replaced by the cyanide functionality. Follow the substitution described in the solution rather than assuming a different leaving group.

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