CH2H5OH\mathrm{CH}_{2} \mathrm{H}_{5} \mathrm{OH}CH2H5OH
C2H5COOH\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{COOH}C2H5COOH
C6H5OH\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{OH}C6H5OH
C6H5COOH\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{COOH}C6H5COOH