An aldehyde differs from a ketone because of its hydrogen atom attached to its carbonyl group, making aldehydes easier to oxidize. Ketones don't have a hydrogen atom bonded to the carbonyl group, and are more resistant to oxidation.
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Find the eight- or nine-digit serial number on the Garmin product. If you are unsure where to find the serial number, navigate to the Garmin How To Find Serial Number webpage to learn where the serial number is on the specific product. Call Garmin customer service at (913) 397-8200 during normal business hours.