COMEDK · Chemistry · 27. Aldehydes and Ketones

What is/are the product/s formed when Benzaldehyde and Ethanal react in presence of dil. \(\mathrm{NaOH}\) followed by heating the intermediate product formed?

A Only product is But-2-enal
B Only product is 2-Phenylprop-2-enal
C 2-Methylpent-2-enal & But-2-enal
D 3-Phenylprop-2-enal & But-2-enal

Verified Solution

Answer & Solution

Correct Answer

(D) 3-Phenylprop-2-enal & But-2-enal

Step-by-step Solution

Detailed explanation

The reaction between Benzaldehyde (\(C_{6}H_{5}CHO\)) and Ethanal (\(CH_{3}CHO\)) in the presence of dilute \(NaOH\) is a crossed aldol condensation. Since Benzaldehyde has no \(\alpha\)-hydrogen, it acts as the electrophile, while Ethanal acts as the nucleophile. The initial…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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