# Formation of oximes by ketones and aldehydes

Why do symmetric ketones form a single oxime and asymmetric aldehydes and ketones can form two isomeric oximes?

• Because geometric isomerism. – Mithoron Jun 27 '18 at 23:14

• Good answer and +1 from me. Might be worth noting that hydroxylamine_s_ react as a class -- the reaction happens w/ more than just $\ce{NH2OH}$. O-methyl hydroxylamine gives O-substituted oximes, etc. – Curt F. Jun 28 '18 at 16:22