Iodoform test is not given by

Options

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

Answer

D

Explanation

Idoform test is given by compounds which have `(CH_(3)-CO-)"group or" (CH_(3)-underset(OH)underset(|)overset(H)overset(|)C-)` group.
Hence 2=-pentanone, `CH_(3)CHO and C_(2)H_(5)OH` give this test. But 3- pentanone `(CH_(3)CH_(2)COCH_(2)CH_(3))` does give idoform test.
`underset("2-pentanone")(CH_(3)COCH_(2)CH_(2)CH_(3))+3I_(2)+4NaOH to underset("iodoform (yello ppt)")(CHI_(3))darr`
`+CH_(3)CH_(2)CH_(2)COONa+3NAI+2H_(2)O`
`underset("ethanal")(CH_(3)-CHO)+3I_(2)+4NaOHrarrunderset(("yellow ppt."))underset("iodoform")(CHI_(3))darr+HCOONa+3NaI+3H_(2)O`
`underset("ethanal")(C_(2)H_(5)OH)+4I_(2)+6NOaOH to underset("iodoform(yellow ppt)")(CHI_(3)darr)+HCOONa+5NaI+5H_(2)O`
`CH_(3)-CH_(2)-underset(3"pentanone")(CO)-CH_(2)-CH_(3)+I_(2)+NaOH to No "reaction"`