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8.3. Organic chemistry purification and characterization — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistry8.3. Organic chemistry purification and characterization1 Mark
MCQ
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 $............\,\times 10^{-2}$
  • A
    $24$
  • ✓
    $25$
  • C
    $23$
  • D
    $22$
✓

Answer

Correct option: B.
$25$
b
More $R _{ f }$, less its polarity

$R _{ f }=\frac{\text { Distance travelled by compound ' } X \text { ' }}{\text { Distance travelled by solvent ' } Y '}$

$=\frac{2}{8}=0.25=25 \times 10^{-2}$

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