29. Solving a chemistry problem

8. The distances covered by the chart tape of the potentiometer-recorder from the introduction of the fusel oil sample into the chromatographic column until the maxima of chromatographic peaks No. 1,2,3 appear are respectively equal to 2.16; 4.50 and 6.50 cm. The speed of the chart tape is 10 mm/min. The retention times tr, established for alcohol preparations classified as “chromatographically pure”, under the same conditions are:
Alcohol Ch3OH C2H5OH C3H7OH C4H9OH C5H11OH C2H5OH C6H13OH
tr, from 75 90 130 270 390 480
Identify the alcohols in fusel oil.