Which of the following will form a yellow precipitate of iodoform on heating with `I_(2)` and dilute `NaOH`?

Options

A. `CH_(3)CH_(2)CH_(2)OH`
B. `CH_(2)CHOHCH_(3)`
C. `PhCH_(2)CH_(2)OH`
D. `PhCH_(2)CHOHCH_(2)CH_(3)`

Answer

B

Explanation

An alcohol of the structure
`R-underset(OH)underset(|)overset(H)overset(|)(C )-CH_(3)`
where `R` is `H` or any alkyl or any aryl group is oxidized to acetaldehyde or a methyl ketone, and hence gives a positive iodoform test
`CH_(3)-underset(OH)underset(|)overset(H)overset(|)(C )-CH_(3)underset("yellow precipitate")(overset(I_(2))underset(NaOH)(rarr)CHI_(3))`