Identification Of An Unknown Aldehyde or a Ketone Prelab 4 Include reaction diagrams for all the tests and for the dinitrophenylghydrazone formation. SUBTOTAL PRE-LAB: 4 points Record physical characteristics 1 Record results of two tests 2 Record melting point of derivative made 3 SUBTOTAL LAB: 6 points ID unknown correct 2 Correct structure given for unknown 2 Quality of measured melting point 1 Questions 1-5 5 SUBTOTAL POST-LAB: 10 points