Question

Given below are two statements :
Statement I : Acidity of -hydrogens of aldehydes and ketones is responsible for Aldol reaction.
Statement II : Reaction between benzaldehyde and ethanal will NOT give Cross – Aldol product.In the light of above statements, choose the most appropriate answer from the options given below.

• A. Both Statement I and Statement II are correct.
• B. Both Statement I and Statement II are incorrect.
• C. Statement I is incorrect but Statement II is correct.
• D. Statement I is correct but Statement II is incorrect.

Answer 1

Answer: (D)

Statement I is correct but Statement II is incorrect.

Answer 2

Explanation of Statement I:

Aldehydes and ketones with at least one $\alpha$-hydrogen can undergo an aldol reaction due to the acidity of the $\alpha$-hydrogens.
This acidity allows the formation of an enolate ion, which then attacks the carbonyl carbon of another molecule, leading to the aldol product.
Therefore, Statement I is correct.

Explanation of Statement II:

Benzaldehyde does not contain an $\alpha$-hydrogen, so it cannot form an enolate ion.
However, ethanol (in this context, likely meaning acetaldehyde) does have $\alpha$-hydrogens and can participate in the aldol reaction with itself or with other compounds that can form enolate ions.
Thus, a cross-aldol product can form between benzaldehyde and acetaldehyde (ethanal).
Therefore, Statement II is incorrect.

Conclusion:

Statement I is correct, but Statement II is incorrect. The correct answer is Option (4).