(Given: specific rotations of ($+$)-sucrose, ($+$)-maltose, $L$-($-$)-glucose anc. $+(+)$-fructose in aqueous solution are $+66^{\circ},+140^{\circ},-52^{\circ}$ and $+92^{\circ}$, respectively)

($A$) 'invert sugar' is prepared by acid catalyzed hydrolysis of maltose

($B$) . 'invert sugar' is an equimolar mixture of $D$-($+$)-glucose and $D$-($-$)-fructose

($C$) specific rotation of 'invert sugar' is $-20^{\circ}$

($D$) on reaction with $\mathrm{Br}_2$ water, 'invert sugar' forms saccharic acid as one of the products

$\begin{align}
   \begin{matrix}
   C{{H}_{3}}-CH-C{{O}_{2}}H  \\
   |\,\,\,\,\,\,\,\,  \\
   \underset{\oplus }{\mathop{N}}{{H}_{3}}  \\
\end{matrix}\,\,\,\,\,\,p{{K}_{a}}=2.2 \\ 
  \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,p{{K}_{b}}=4.4 \\ 
\end{align}$