There is some problem with my code. It don't show Mg(OH)X correctly and arrow passes to reactant sites also
\documentclass[11pt]{article}
\usepackage{chemfig}
\begin{document}
\schemestart
\chemname{\chemfig{HC~CH}}{Acetylene}
\arrow{->[Red Hot \chemfig{Cu} tube][400C]}
\chemname{\chemfig{**6(------)}}{Benzene}
\+ \chemfig{Mg (OH) Cl}
\schemestop
\end{document}
It gives me output like these :(
Clearly they are not aligned and the arrow length is very short and how to show degree at 400 degree celcius below arrow and how to display Mg(OH)X correctly .
Thank YOU :)