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JEE Chemistry 2023 Question with Solution

The major product for the following reaction is :

HS−CN→HO−C=NH CNHS-CN \xrightarrow{} HO-C = NH\, CN

Reactant structure shown with an alkene nitrile substrate reacting in the presence of 2-mercaptoethanol under indicated conditions.
  • A
    Option A shows a product with nitrile and thiol groups connected through an ether-like carbon chain arrangement.
  • B
    Option B shows a product containing hydroxyl and sulfur atoms in the chain with terminal nitrile substitution.
  • C
    Option C shows an imidate-like structure where oxygen is bonded to the two-carbon chain ending in sulfur.
  • D
    Option D shows an imidothioate-like structure where sulfur is bonded to the two-carbon chain ending in hydroxyl.

Answer

Correct answer:D

Step-by-step solution

Standard Method

Given: A reaction is shown and the solution states that the correct option is D.

Find: The major product.

The solution explicitly concludes: The Correct Option is D.

The accompanying explanation text on the page appears unrelated to the displayed reaction, so the reliable grounded conclusion available from the solution is the marked option itself.

Therefore, the major product is Option D.

Common mistakes

  • Choosing a product only from the unrelated explanatory paragraph is incorrect because that text discusses alkane isomerisation, not the displayed reaction. Use the explicit conclusion on the solution and the reaction figure instead.

  • Confusing the attachment through O versus S is a common error. Compare the displayed product structures carefully before selecting the final option.

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