documentclass{article}
usepackage{chemfig}

begin{document}
begingroup

centering
setatomsep{3em}chemname{chemfig{C(-[:180]H)*6(-C(-H)=C(-H)-C(-H)=C(-H)-C(-H)=)}}{Lewis
structure\of benzene}
qquad
setatomsep{3em}chemname{chemfig{**6(------)}}{Cyclic compound\of benzene}

endgroup
end{document}

documentclass{article}
usepackage{chemfig}
usepackage{calc}

begin{document}
begingroup

centering
setatomsep{3em}chemname{raisebox{depth-totalheight/2}{chemfig{C(-[:180]H)*6(-C(-H)=C(-H)-C(-H)=C(-H)-C(-H)=)}}}{Lewis
structure\of benzene}
qquad
setatomsep{3em}chemname{raisebox{depth-totalheight/2}{chemfig{**6(------)}}}{Cyclic compound\of benzene}

endgroup
end{document}