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JEE Main2026Jan 24, Shift 2Chemistry
Q.

Given below are two statements :

Statement I : Cross aldol condensation between two different aldehydes will always produce four different products.

Statement II : When semicarbazide reacts with a mixture of benzaldehyde and acetophenone under optimum pH, it forms a condensation product with acetophenone only.

In the light of the above statements, choose the correct answer from the options given below :

  1. A

    Both Statement I and Statement II are false

  2. B

    Statement I is false but Statement II is true

  3. C

    Both Statement I and Statement II are true

  4. D

    Statement I is true but Statement II is false

Solution

Statement I: A cross aldol between two different aldehydes (both having -H) gives self-condensation products as well as cross products. However, "always four" is incorrect; if only one of the aldehydes has -H, only two products form. So the statement is false.

Statement II: Semicarbazide is a weak nucleophile and reacts with both benzaldehyde and acetophenone at optimum pH; it does not react selectively with acetophenone only. So the statement is false.

Both statements are false.

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