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# Which one of the following gives yellow precipitate with iodine and $NaOH$ solution ?

$\begin {array} {1 1} (1)\;CH_3 - CHO & \quad (2)\;C_6H_5C0C_6H_5 \\ (3)\;HCHO & \quad (4)\;CH_3OH \end {array}$

$(1)\;CH_3 - CHO$