Correct Answer - D
the compounds which contain either
`CH_(3)-CO-`group or `CH_(3)-underset(OH)underset(|)(C)H` group give postiive
Iodoform test In 2-pentanone, `(CH_(3)CH_(2)CH_(2)COCH_(3)),CH_(3)CHO and C_(2)H_(5)OH`, required groups are present, thus they give iodoform as follows
`CH_(3)-COCH_(2)-CH_(2)CH_(3)+3I_(2)+4NaOHtounderset("Iodoform (yellow ppt.)")(CHI_(3))darr+CH_(3)CH_(2)CH_(2)COONa+3NaI+3H_(2)O`
`CH_(3)CHO+3I_(2)+4NaOHto underset("Iodoform (Yellow ppt.)")CHI_(3))darr+HCOONa+3NaI+3H_(2)O`
`C_(2)H_(5)OHoverset(I_(2))toCH_(3)CHO`
`CH_(3)CHO+3I_(2)+4NaOHtounderset("Iodoform")(C HI_(3))darr+HCOONa+3NaI+3H_(2)O`
But due to absence of `CH_(3)-underset(OH)underset(|)(C)H` or `CH_(3)-underset(|)(C)=`
Group in 3-pentanone, it does not give iodoform
`underset("3-pentanone")(CH_(3)-CH_(2)-overset(O)overset(||)(C)-CH_(2))-CH_(3)+I_(2)+NaOHto` No reaction.
