\(10.2\,g\) ascorbic acid \(\Rightarrow 0.058\) moles
\(\Delta T _{ f }=\left( x \times 10^{-1}\right)^{\circ} C\)
\(\Delta T _{ f }= k _{ f } \cdot \text { molality }\)
\(=3.9 \times \frac{0.058}{150} \times 1000\)
\(=1.5^{\circ}\,C\)
\(=15 \times 10^{-1 \circ}\,C\)
$\begin{matrix}
C{{H}_{3}}CHCOOH\xrightarrow{\Delta }\,Product \\
|\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
OH\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, \\
\end{matrix}$