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  4. Which one of the following gives yellow precipitate with iodine and NaOH solution?

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

EAMCETEAMCET 2010

Solution:

Alcohols containing $CH _{3} CH ( OH )-$ group and carbonyl compounds containing $CH _{3} CO -$ group give yellow precipitate with iodine and $NaOH$ solution.
This reaction is called iodoform test.
Thus, $CH _{3} CHO$ due to presence of $CH _{3} CO$ group gives yellow ppt with $I _{2}$ and $NaOH$.
$CH _{3} CHO +3 I _{2}+4 NaOH \longrightarrow CHI _{3}$
$+ HCOONa +3 NaI +2 H _{2} O$