Applicable for A-Level, IB, DSE, AP-Level Exams
Aldehydes can be distinguised from other organic compounds by using either Fehling's Solution (which turns red in the presence of aldehydes) or Tollen's Reagent (which forms a silver mirror).
Aldehydes or ketones can be reduced to primary and secondary alocohols respectively by using NaBH4 in methaol with water.
Hydroxynitriles can be formed by the nucleophilic addition of an aldehyde or a ketone with acidfied KCN and heat under reflux.