Reduction: ketone + NaBH₄ → secondary alcohol
HCN reaction: ketone + HCN → cyanohydrin
Alcohol reaction: ketone + alcohol → hemiacetal → ketal
Grignard reaction: ketone + Grignard reagent → tertiary alcohol
Aldol condensation: ketone → α,β-unsaturated ketone + water
Halogenation: ketone + bromine → α-bromo ketone