Which of the following regent will not respond to iodoform test ?

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{OH}$

$\mathrm{CH}_{3} \mathrm{CHOHCH}{ }_{3}$

$\mathrm{CH}_{3} \mathrm{COCr}_{2} \mathrm{CH}_{3}$

$\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{OH}$