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  4. The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance A and substance B from the base line are 3.25 cm .2 .08 cm and 1.05 cm. respectively. The ratio of Rf values of A to B is

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Q. The separation of two coloured substances was done by paper chromatography. The distances travelled by solvent front, substance $A$ and substance $B$ from the base line are $3.25\, cm .2 .08 \, cm$ and $1.05\, cm$. respectively. The ratio of $R_f$ values of $A$ to $B$ is _______

JEE MainJEE Main 2022Organic Chemistry – Some Basic Principles and Techniques

Solution:

$ROH + CH _3 MgI \rightarrow ROMgI + CH _4( g )$
moles of $CH _4=$ moles of $ROH$
$\Rightarrow \frac{ V }{22400}=\frac{ m }{ M . M } $ (Assuming NTP Condition)
$ \Rightarrow \frac{3.1}{22400}=\frac{4.5 \times 10^{-3}}{ M . M} $
$\Rightarrow MM =32.51$
Nearest Integer $=33$