Explanation

(d)
Iodoform test is given by compounds which have $\left( CH_{3} - CO - \right)$ group or $CH_{3} - CH -$ group.
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OH
Hence, 2-pentanone, $CH_{3}CHO\ and\ C_{2}H_{5}OH$ give the test. But 3-pentanone does not give iodoform test. Actually, iodoform test can be used to distinguish methyl ketones from ketones.