Question

Which of the following is the distinguishing characteristic between aldehydes and ketones?

-Ketones contain an oxygen atom, while aldehydes do not.

-Aldehydes are more substituted versions of ketones.

-Aldehydes contain an oxygen atom bound directly to a hydrogen atom, while the oxygen atoms in ketones are only bound to cabon atoms.

-Ketones contain a carbonyl group between two carbons, while the carbonyl group in an aldehyde must be attached to a hydrogen.

Answer 1

Ketone is: -CO-

Alldehyde is: -CHO

-Ketones contain an oxygen atom, while aldehydes do not.

this is wrong because both contain oxygen atom.

-Aldehydes are more substituted versions of ketones.

This is wrong because, there is no substitution here.

Both have equal degree of unsaturation

-Aldehydes contain an oxygen atom bound directly to a hydrogen atom, while the oxygen atoms in ketones are only bound to cabon atoms.

This is wrong because in none of them oxygen is bonded to Hydrogen.

If oxygen is bonded to hydrogen, it becomes alcohol

-Ketones contain a carbonyl group between two carbons, while the carbonyl group in an aldehyde must be attached to a hydrogen.

This is correct

Answer: last option