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\begin{figure}[h]
\fontsize{20}{24}\selectfont
\includegraphics[width=4cm]{Image/1024px-Sodium-borohydride}
+ 2
\includegraphics[width=1.7cm]{Image/1280px-H2O_Polarization}
\ce{->}
\includegraphics[width=2.5cm]{Image/Sodium_metaborate_structure}
+ 4
\includegraphics[width=0.8cm]{Image/covalent_bond_hydrogen_3}
\normalsize
\label{figure:borohydride}
\end{figure}