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Isomerism in Aldehydes and Ketones

Aldehydes and Ketones exhibit the following type of somerism:

(a) Chain (nuclear) Isomerism. Aldehydes with 4 or m1ore carbon atoms and ketones with five or more carbon atoms show chain isomerism. For example:

(b) Position lsomerism. Aromatic aldehydes and higher ketones give position isomers. For example:

(c) Functional Isomerism. The general formula of aldehydes, ketones, unsaturated alcohols oxiranes and oxolanes is CnH2nO

C3H6O has isomers as: