(B) Dimethyl ketone $(CH_3-CO-CH_3)$ is a methyl ketone.Methyl ketones react with $I_2$ in the presence of $NaOH$ to form a yellow precipitate of iodo

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(B) Dimethyl ketone $(CH_3-CO-CH_3)$ is a methyl ketone.Methyl ketones react with $I_2$ in the presence of $NaOH$ to form a yellow precipitate of iodoform $(CHI_3)$.This is known as the iodoform test.Tollen's reagent,Schiff's reagent,and Benedict's reagent are primarily used to identify aldehydes.