The reaction in which carbonyl compound having three alpha hydrogen treated with a mixture of halogen and sodium hydroxide to give haloform means trihalomethane.
![](https://chemigod.com/wp-content/uploads/2024/02/image-15.png?w=1024)
NaOH reacts with X2 to produce NaOI which replaces three hydrogen by three halogen atom. here halogens are Cl2, Br2 or I2.
Alpha, beta, gama and delta Carbon / Hydrogen .
1. First carbon / hydrogen from functional group (in this case it is OH) is called ALPHA carbon and hydrogen present on alpha carbon is called ALPHA hydrogen.
2. Second carbon / hydrogen from functional group (in this case it is OH) is called BETA carbon and hydrogen present on alpha carbon is called BETA hydrogen.
3. Third carbon / hydrogen from functional group (in this case it is OH) is called GAMA carbon and hydrogen present on alpha carbon is called GAMA hydrogen.
4. Forth carbon / hydrogen from functional group (in this case it is OH) is called DELTA carbon and hydrogen present on alpha carbon is called DELTA hydrogen.
![](https://chemigod.com/wp-content/uploads/2024/02/image-20.png?w=916)
Example of Haloform Reaction:-
Reaction of Ethanal ( Acetaldehyde)
![](https://chemigod.com/wp-content/uploads/2024/02/image-19.png?w=1024)
Reaction of Propanone (Acetone)
![](https://chemigod.com/wp-content/uploads/2024/02/image-22.png?w=1024)
This reaction is also given by alcohol having three beta hydrogen atoms. alcohol is first converted into carbonyl compound than into haloform.
![](https://chemigod.com/wp-content/uploads/2024/02/image-18.png?w=1024)