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  • Aldehydes and ketones are carbonly compounds which contain a carbon oxygen double bond, called as the carbonyl carbon ( C=O). 
  • In an aldehyde, the carbonyl carbon is attached to a hydrogen atom on one side and an alkyl group on the other side, hence completing its valency by forming 4 bonds ( i.e. a single bond with H, a single bond with an alkyl group and a double bond with oxygen).
  • In ketones, the carbonly carbon is attached to two alkyl groups on either side.
  • Example of aldehyde: Formaldehyde HCOH and of Ketone: Acetone (Dimethyl ketone) (CH3)2CO. 
Answer

In aldehyde, the carbonyl group (C=O) is attached to one hydrogen atom and one terminal alkyl group (R). On the other hand, in ketone, the carbonyl group (C=O) is attached to two alkyl groups from either side. 

Answer
In the case of of aldehyde the carbonyl carbon is attached to the alkyl group from on side and the hydrogen from other side. Whereas in keton the carbonyl carbon is attached to the alkyl group from both the side.
Answer
In aldehyde the corbonyl group (CO group)is attatched to a carbon atom at the "end" of a carbin chain. In ketones carbonyl group is always attatched to a carbon atom "within" the carbon chain.
Answer

In aldehyde, the carbon atom of the carbonyl group is attached to one alkyl group (R) and one hydrogen atom but in ketone, the carbonyl group is attached to two alkyl groups.

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