Question

why ketone is not possible in methane and ethane

Answer 1

Because, there is no carbon atoms present more than three.

Explanation:

The functional group of Ketone (-C=O) should be place between two carbon atoms. Otherwise, it cannot be possible as Methane and Ethane having only one and two carbon atoms. Ketone can be put from the member of Propane as it having carbon atoms 3. So, the functional group of Ketone can be installed between two carbon atoms.

Answer 2

Answer:

Because a ketone specifies an internal carbonyl group.

explanation:

And thus neither

formaldehyde,

H

2

C=O

, nor

acetaldehyde,

H

3

CC

(

=O

)

H

supports an internal carbonyl. Both functions are terminal, and thus these species are formally

aldehydes

. Capisce?

On the other hand,

acetone

,

H

3

CC(=O)CH

3

, does support the internal carbonyl group, and can thus be classified as a

ketone