Question

IR ANALYSIS: The table must list all important IR bands present. Please note if any relevant impurity bands are present which may include those characteristic to the starting material. (Document if they are present or absent for the starting material). A sample IR spectrum and table are shown on page 20. Please include your IR spectra with your report. Frequency 2898.4 1725.6 Bond responsible sp C-H stretch C=O stretch, saturated ketone

Answer 1

In first spectra peaks at 2982^cm-1, 2883cm-1 indicates the aliphatic C-H stretching & C-H bending at 1375^cm-1.

Peak at 1731cm-1 indicates the >C=O stretching which confirms the presence of ketone.

In second spectra this carbonyl stretching at 1731cm-1 disappears completely and new peak formed at 3431 cm-1 which indicates O-H stretching. Peaks for aliphatic C-H stretching are remained same.  It indicates that the starting material get consumed completely. The reaction must be a reduction of Ketone to Alcohol.