A compound C3H6O gives an orange precipitate with 2,4-DNP, gives a yellow precipitate with NaOH/I2 and does not reduce Tollens reagent. The compound is

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A compound $C X_{3} H X_{6} O$ gives an orange precipitate with 2,4-DNP, gives a yellow precipitate with $NaOH / I X_{2}$ and does not reduce Tollens reagent. The compound is

A 2,4-DNP precipitate shows a C=O group; a negative Tollens test rules out an aldehyde. The positive iodoform test needs a

CH X_{3} CO X^{-}

group. Among the

C X_{3} H X_{6} O

isomers only

CH X_{3} COCH X_{3}

(propanone) fits all three observations.