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Which of the following will give yellow precipitate with I2/NaOH

(1)CH3CH2COCH2CH3(2)CH3COOCOCH3(3)CH3CONH2(4)CH3CH(OH) CH2CH3

Iodoform test is given by the compounds containing terminal CH3CO- and CH3CH(OH)- group
Thus it is given by compound (4) only .Since only 4 contains alpha hydroxyl group and it is not given by  acid derivatives.

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Since, this reaction is given by the compunds with ( CH3 - C0-) group. So,

(2) CH3COOCOCH3 and ( 3) CH3CONH2

GIve yellow precipitate by the formation of Iodoform.

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Only (4) will give yellow ppt.

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