Aldehydes
- They are carbon compounds attached to CHO (Aldehyde group) .
- Their IUPAC names end with the suffix ‘al’.
- The C atom is double bonded to the Oxygen and single bonded to a hydrogen to form the aldehyde.
Example: Methanal , Ethanal are aldehydes.
|
Number of Carbon Atoms |
Methane Name |
Aldehydes Name |
|
1 |
Methane |
Methanal |
|
|
CH 4 |
HCHO |
|
2 |
Ethane |
Ethanal |
|
|
C 2 H 6 |
CH 3 CHO |
|
3 |
Propane |
Propanal |
|
|
C 3 H 8 |
C 2 H 5 CHO |
|
4 |
Butane |
Butanal |
|
|
C 4 H 10 |
C 3 H 7 CHO |
Naming of Aldehydes:
Step 1
We determine the prefix by seeing the number of carbon atoms in the longest chain in the parent alkane.
Step 2
We use the suffix 'al' for (CHO) group .
Example
If we have to Name HCHO :
- It has 1 Carbon Atom, it means it is Meth
- Since it has (CHO) attached, we use the suffix 'anal'
- Hence we get Methanal
Example
- If we have to name CH 3 CHO:
- It has 2 carbon atoms, it means it is Eth.
- Since it has (CHO) attached, we use the suffix ‘al’. Hence we get Ethanal.
