MHT CET · Chemistry · Alcohols Phenols and Ethers

Iodoform test is not given by

A 2 -pentanone
B ethanol
C ethanal
D 3-pentanone

Verified Solution

Answer & Solution

Correct Answer

(D) 3-pentanone

Step-by-step Solution

Detailed explanation

Iodoform test is given by compounds which have

group or

group, Hence, \(\quad\) 2-pentanone, \(\mathrm{CH}_{3} \mathrm{CHO}\) and \(\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}\)
give this test. But 3-pentanone \(\left(\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{2} \mathrm{CH}_{3}\right)\) does not give iodoform test.

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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