MHT CET · Chemistry · Aldehydes and Ketones

Which of the following compounds does not undergo haloform reaction?

A Ethanal
B Propanal
C Propanone
D Butanone

Verified Solution

Answer & Solution

Correct Answer

(B) Propanal

Step-by-step Solution

Detailed explanation

Haloform reaction is given by acetaldehyde, all methyl ketones \(\left(\mathrm{CH}_3-\mathrm{CO}-\mathrm{R}\right)\) and all alcohols containing \(\mathrm{CH}_3(\mathrm{CHOH})-\) group.
Propanal \(\left(\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO}\right)\) does not have \(\mathrm{CH}_3 \mathrm{CO}\) group and hence does not give haloform reaction.
Thinking Hatke - Q. 31
This reaction can be used to distinguish methyl ketones \(\left(\mathrm{CH}_3 \mathrm{CO}-\right)\) from ketones.

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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