What is the difference between a ketone and aldehyde?

Ketone and aldehydes are functional groups that organic compounds have. A ketone is C=O that is connected to a carbon on both sides. Therefore it is always found inside a chain and never at the end. Aldehyde, on the other hand is C=O that is connected to a carbon on one side and hydrogen on another. Therefore, aldehydes are found at the end of chains.

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