Sucrose $\underset{{\mathrm{H}}^{+}}{\overset{{\mathrm{H}}_2\mathrm{O}}{\to }}$ Y and X. The total number of optical isomers possible for Y and X is ____. 

 

$\mathrm{Sucrose} \stackrel{{\mathrm{H}}^{+}/{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{Glucose} +\hspace{0.17em}\mathrm{Fructose}$

Glucose have 16 isomers and Fructose have 8 isomers 

total isomers = 16 + 8 =24