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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2. Connect your Garmin Nuvi to your computer via USB cable. You can only update the maps through connecting to your computer. You can use any Mini USB cable to connect the device to your computer.