222 Aldehydes and Ketones QUESTIONS 1. Write the balanced equation for the reaction that occurs between 2,4-dinitrophenylhydrazine and cyclopentanone. 2. Write the balanced equation for the reaction that occurs between the Tollens' reagent and benzaldehyde. 3. Discuss the result you would obtain if you ran the lodoform test on 2-pentanol. 4. The boiling points of 2-pentanone and 3-pentanone are identical. Indicate how the preparation of the 2,4-dinitrophenylhydrazone derivative is useful in identifying the two ketones. 5. An unknown liquid does not react when heated with an ammoniacal silver nitrate solution. The compound gives a positive lodoform test. The 2,4-dinitrophenylhydrazone derivative of the same unknown had a melting point of 115-117°C. Identify the unknown. Discuss the reasons for your identification. (89) lone