Three organic compounds A,B and C were allowe | vedclass

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(B) In thin layer chromatography $(TLC)$,the stationary phase is polar (silica gel) and the mobile phase is non-polar (hexane).Compounds that are more

Vedclass · Accepted Answer

$25$

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(B) In thin layer chromatography $(TLC)$,the stationary phase is polar (silica gel) and the mobile phase is non-polar (hexane).Compounds that are more polar interact more strongly with the stationary phase and travel a shorter distance,resulting in a lower $R_f$ value.Compounds that are less polar travel a longer distance,resulting in a higher $R_f$ value.From the figure,the distances traveled by compounds $A$,$B$,and $C$ are $6 \ cm$,$4 \ cm$,and $2 \ cm$ respectively,with the solvent front at $8 \ cm$.The compound that travels the shortest distance is the most polar.Thus,compound $C$ is the most polar.The $R_f$ value for compound $C$ is calculated as:$R_f = \frac{	ext{Distance traveled by compound } C}{	ext{Distance traveled by solvent}} = \frac{2 \ cm}{8 \ cm} = 0.25$Converting this to the required format:$0.25 = 25 	imes 10^{-2}$

Column-$I$	Column-$II$
$(i)$ Differential extraction	$(p)$ High difference of boiling point
$(ii)$ Steam distillation	$(q)$ Separatory funnel
$(iii)$ Distillation at low pressure	$(r)$ Component of petroleum
$(iv)$ Simple distillation	$(s)$ Liquid decompose at high temperature
$(v)$ Fractional distillation	$(t)$ Vacuum pump

Three organic compounds $A$,$B$ and $C$ were allowed to run in thin layer chromatography using hexane and gave the following result (see figure). The $R_f$ value of the most polar compound is $............\, \times 10^{-2}$

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