Iodoform test is not given by

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Ethanol

Ethanal

Pentan-2-one

Pentan-3-one

answer is D.

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Detailed Solution

The iodoform test is used to determine whether a given unknown chemical contains carbonyl compounds with the structural formula $R - CO - {CH}_{3}$ or alcohols with the formula $R - CH (OH) - {CH}_{3}$ .
Iodine, a base, and a methyl ketone react to produce a yellow precipitate and an "antiseptic" odour.
It additionally exhibits positive results for a small number of certain secondary alcohols with at least one methyl group in the alpha position.
3-pentanone ${CH}_{3} - {CH}_{2} - CO - {CH}_{2} - {CH}_{3}$ . It does not have a $- CO - {CH}_{3}$ group. Hence it does not show the iodoform test.

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