i. Cyclopentanone reacts with hydroxyl amine to form oxime.
ii. Cyclohexanone reacts with 2,4-dinitro phenyl hydrazine to form 2,4-dinitro phenyl hydrazone.
iii. α β unsaturated aldehyde reacts with semicarbazide (H2NCONHNH2) to form semicarbazone.
iv. Acetophenone reacts with ethyl amine to form an imine