\(\frac{\Delta T _{ b }}{\Delta T _{ f }}=\frac{ K _{ b } \times 1}{ K _{ f } \times 2}\) \(\Rightarrow \frac{3}{6}=\frac{1}{2}=\frac{ K _{ b }}{ K _{ f }} \times \frac{1}{2}\)
\(\frac{ K _{ b }}{ K _{ f }}=\frac{1}{1} \Rightarrow x =1\)
(ઉપયોગ $R$ $=0.083\,L\,bar\,K ^{-1}\,mol ^{-1}$ )