Which is correct about aldehyde, ketone, carboxylic acid, alcohol and ester? an aldehyde has a carbonyl group -CO- on the inside of the carbon chain; a ketone has a group -CHO at the end of the carbon chain. a fatty acid is a carboxylic acid; a triacylglycerol is an ester. alcohol has a total of two types: primary alcohol and secondary alcohol. fructose is an aldehyde; glucose is a ketone.

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