Which of the following does NOT give the iodoform test with I2 and aqueous NaOH?

JEE Main levelSingle correct optionDifficulty 2 of 3hx133

Which of the following does NOT give the iodoform test with $I X_{2}$ and aqueous $NaOH$ ?

The test needs a

CH X_{3} - CO X^{-}

group or a

CH X_{3} - CH (OH) X^{-}

group (oxidised to it in situ). Ethanol, propan-2-ol and acetophenone have one of these; propan-1-ol is

CH X_{3} CH X_{2} CH X_{2} OH

and has neither.