Which reaction is used for detection of CH3CHO (Acetaldehyde) or CH3CH2OH (Ethanol) group?
(a) Aldol reaction
(b) Iodoform reaction
(c) Clemmensen reaction
(d) Friedel-Crafts acetylation
Answer:
(b) Iodoform Reaction
Explanation:
The Iodoform test is a chemical reaction used to detect the presence of a methyl ketone (-COCH3 group) or ethanol (CH3CH2OH).
How It Works:
When acetaldehyde (CH3CHO) or ethanol (CH3CH2OH) reacts with iodine (I2) in the presence of NaOH, a yellow precipitate of iodoform (CHI3) is formed.
Formation of yellow ppt(CHCl3)This confirms the presence of either CH3CHO or CH3CH2OH in a given compound.