hi need help identifying the unknown compund and the fuctional groups of the IR

IR Unknowns benzamide 3,3-dimethylpentane phenyl propyl ether 4-methylbenzophenone pivalic acid cyclohexanol benzoin 4-pentenoic acid 2-methylpropanal 2-buten-1-ol phthalic acid 2.hexenal 2-propyn-1-ol 3,3-dimethyloutanoyl chloride methyl lactate 5-phenyl-1-pentyne tert-butyl aicohol phenylethyne 2-hexanone tert-butyl chloride N acetonitrile cyclopentanone hexanoic anhydride 1,8-naphthalic anhydride ethyl benzoate 3-hydroxy-3-methyl-2-butanone 4-tert-butylcyclohexanone