Question

what is the difference between aldehyde group & ketone group with example.

Answer 1

If *both* of the other two bonds are to carbon atoms, then it is a ketone. If at least one of those bonds is to a hydrogen atom, then it is an aldehyde. Above is an example of an aldehyde because the carbon that is double bonded to oxygen is also bonded to a hydrogen atom.
OR
An example of an aldehyde is cinnamaldehyde while the simplest form of ketone is probably acetone. 1. In aldehydes, the carbon atom in the carbonyl group is bounded to a hydrogen and one carbon atom while in ketones it is bound to two other carbon atoms.

Answer 2

Aldehydes and ketones are organic compounds which incorporate a carbonyl functional group, C=O. The carbon atom of this group has two remaining bonds that may be occupied by hydrogen or alkyl or aryl substituents. If at least one of these substituents is hydrogen, the compound is an aldehyde. If neither is hydrogen, the compound is a ketone.