Every aldehyde and ketone contains a carbonyl bond which is >C=O , and at least one carbon atom (and a ketone must have at least three carbon atoms).
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Aldehydes and ketones both contain a carbonyl group, which is a carbon atom double-bonded to an oxygen atom. In aldehydes, the carbonyl group is located at the end of a carbon chain, while in ketones, it is located within the carbon chain.
Yes, aldehyde is a structural isomer of a ketone. Both aldehydes and ketones contain a carbonyl group, but in aldehydes, the carbonyl group is located at the end of the carbon chain, while in ketones, it is located within the carbon chain.
The general formula for aldehydes is RCHO (where R is a hydrocarbon group), and the general formula for ketones is R2CO (where R is a hydrocarbon group).
Aldehydes and ketones haven't an -OH group.
KCN does not react with aldehydes and ketones because these compounds do not have an acidic hydrogen that can be removed to form an enolate ion, which is necessary for nucleophilic addition reactions with cyanide ions. Aldehydes and ketones lack the necessary alpha carbon acidity to undergo this reaction with KCN.
No, monomers and polymers of aldehydes and ketones do not have hydroxyl groups attached. Aldehydes and ketones have a carbonyl group (C=O) attached to at least one carbon atom and do not have any hydroxyl groups (-OH) attached to the carbon chain.