3. refer to the ft-ir spectrum, obtained in lab, of your reaction product. attach a printout of your ft-ir spectrum at the end of the lab report. a reference ft-ir spectrum of 2,4- dinitrobromobenzene is included on page 4. identify the specific, diagnostic absorption band(s), or absence of absorption band(s), that support the identity of the compound in your ft-ir spectrum. for each band, include the functional group responsible and the specific bond vibration (for example: 3065 cm-1, aromatic c-h stretch).