Calculate the R _F values for the following compounds: spot A migration distance

Question

Calculate the R _F values for the following compounds: spot A migration distance is 3.20cm start we. What is 6.65 cm from the beginning of plate. Migration distance of the solvent front is 8.5 cm from the the value of separation factor (alpha) between spots A and B. The chromatographic system consists of silica gel and chloroform as the mobile phase Rf _a = 3 20/8.5 = 0.35 Rf _b = 6.6 J/8.J =0.78 k _a = 1-0.3 J/3 J =1.8 I 1.07 omega/0.7 omega = 0.28 1.8I/0.28 = 6.60 what types of the intermolecular bonds are mainly responsible for the following spot distances of the the longest_____ the shortest ______ presented in Q-3 (fill empty places with the proper words among the presented:dispersion forces, dipole-dipole interactions, covalent bonds, hydrogen bonds) calculate the absorptivity of an organic dye (C = 8.8x10^-5 mol L^-1).if the absorbance A = 025 and that the of the optical path of the cell used is 1-5 cm. A = sigma I C 0.2J = 8.8 times 10^-J 0.2J = 1.32 times 10^-4 sigma = 1893.93 What would happen to the transmittance if the cell used was of one third its present thickness? A = 2 - log (90 T)

Explanation / Answer

4a) the longest spot distance will be seen in "COVALENT BONDS" due to less force of attraction between the molecules the spot will travel the longest distance because of less polarity and hence the compound having covalent bond in its molecules will have the longest spot distance
4b) the shortest distance will be in case of "HYDROGEN BONDS" because of its very high polarity, the bonds are held very tightly and so the spot distance is minimum in this case


tough in dipole dipole interaction also the spot length is very short but in case of HYDROGEN BONDING it is the least that's why the answer will HYDROGEN BOND for shortest length and COVALENT BOND fo longest lenght

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