Check sibling questions

An aldehyde as well as a ketone can be represented by the same molecular formula, say C 3 H 6 O. Write their structures and name them. State the scientific relation between the two.

 

Answer

  • Aldehydes are carbon compounds in which a carbon atom, in the carbon chain, shares a double bond with an oxygen atom and a single bond with a hydrogen atom.
  • Ketones are carbon compounds in which a carbon atom, in the carbon chain, shares a double bond with an oxygen atom.

Any carbon compound with 3 carbon atoms in the carbon chain starts with “prop” and having an aldehyde functional group ends with “al”.

So,the aldehyde with molecular formula C 3 H 6 O is propanal.

Structure of Propanal - Teachoo.png

Any carbon compound with 3 carbon atoms in the carbon chain starts with “prop” and having a ketone functional group ends with “one”.

So,the ketone with molecular formula C 3 H 6 O is propanone.

Structure of Propanone - Teachoo.png

Isomers are compounds having the same molecular formula but different functional groups/structural formula.

Propanal and propanone have the same molecular formula i.e. C 3 H 6 O but different functional groups ( ketone and aldehyde respectively). Therefore, they are isomers.

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