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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1 Connect your Garmin GPS device to your computer. 2  Click Download Now. 3  Click Open, if necessary. 4  Click Extract. 5  Find the âGarmin/Voiceâ folder on the Garmin drive. 6  Double-click the Unplug or Eject icon in your system tray. 7  Click Stop, then click OK. 8  Unplug the USB cable from your device.