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Label the stretches in the IR spectrum shown that confirm the presence of benzil in the sample. Then, identify -stretch that would indicate the presence of starting material (benzoin) Infrared Spectrum of Benzilic Acid, KBr 25 sp2 ; C=0 Answer Bank 20 1 sp, C=0 sp? C-H Sp" 0-H (ROH) 8p"_ 0-H(COOH) 2950 cm " sp? , C_H 34400 cm ! 1640 cm " 4000 3500 3000 2500 2000 1500 Wavenumbers (cm ') 1000