Select IR 2: chloroform deuterochloroform n-decane t-butanol dilute t-butanol in choloroform 3-methoxyphenol butyl acetate 3-bromoaniline 2-phenylethanol m-xylene o-xylene p-xylene 4-methoxycinnamaldehyde cyclopentanone cyclohexanone 4-vinylpyridine o-anisidine N,N-diethylaniline