$R _{ f }=\frac{\text { distance covered by substance from base line }}{\text { total distance covered by solvent from base line }}$
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The functional group present in $B$ and name of the reaction would be
$I.$ In gaseous phase, the vapour pressure of $CH_3COOH$ is less than expected.
$II.$ In benzene, acetic acid dimerises.
$III.\, CH_3OH$ is more viscous than $H_2O.$
$IV.\, CH_3OCH_3$ is non-polar but soluble in water.
Select the correct set of codes using $T$ for true and $F$ for false statements in given sequence.