Concepts

Class 10
Chapter 4 Class 10 - Carbon and its Compounds

## Ketones

• They are Carbon Compounds attached to CO (Ketone group)
• They are represented by ‘none’.
• Examples Propanone, Butanone are Ketones.

 Number of Carbon Atoms Alkane Name Ketone Names 1 Methane CH 4 - 2 Ethane C 2 H 5 - 3 Propane Propanone C 3 H 8 C 3 H 6 0 4 Butane Butanone C 4 H 10 C 4 H 8 0 5 Pentane Pentanone C 5 H 12 C 5 H 10 O 6 Hexane Hexanone C 6 H 14 C 6 H 12 0

Note:

• There should be at least 3 carbon atoms to form Ketone
• It is because the ketone group (-CO) always appears in the middle of the carbon chain.
• It is surrounded by at least 1 carbon atom on each side.

### Naming of different Ketones:

Step 1

We take Parent alkane by seeing number of carbon atoms

(If 3 carbon atoms, it is Prop, if 4 carbon atoms, we use But)

Step 2

We use the suffix like 'one' for (CO) group .

Example

• If we have to Name CH 3 COCH 3 ,
• It has 3 carbon atoms, it means it is 'Prop'

Since it has (CO) attached, we use 'one' suffix . Hence we get Propanone. Hence, there are a total of at least 3 carbon atoms.(One of CO group and other 2 of surrounding carbon atoms)

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