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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On January 13, 2014 Garmin announced its new rugged handheld GPS device called the GPSMAP 64st. As a continuation of the 62 series, the newly introduced 64 series is filled with better technologies and more user-friendly.