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Question

(A) Alcohols containing the $CH_3CH(OH)-$ group and carbonyl compounds containing the $CH_3CO-$ group give a yellow precipitate with iodine and $NaOH$

Vedclass · Accepted Answer

$CH_3-CHO$

Vedclass · Answer

(A) Alcohols containing the $CH_3CH(OH)-$ group and carbonyl compounds containing the $CH_3CO-$ group give a yellow precipitate with iodine and $NaOH$ solution. This reaction is known as the iodoform test.Thus,$CH_3CHO$,due to the presence of the $CH_3CO-$ group,gives a yellow precipitate with $I_2$ and $NaOH$.The reaction is: $CH_3CHO + 3I_2 + 4NaOH \longrightarrow CHI_3 + HCOONa + 3NaI + 3H_2O$.

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

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