答案1
\documentclass{article}
\usepackage{chemfig}
\usetikzlibrary{decorations.pathmorphing}
\begin{document}
\chemfig{*6(---(--[:120,,,,decorate,decoration=snake])---)}
\chemfig{*6(---(-(-[:-45,,,,decorate,decoration=snake])-[:120,,,,decorate,decoration=snake])---)}
\chemfig{*6(-N(-(-[:0,0.7,,,decorate,decoration=snake])-[:180,0.7,,,decorate,decoration=snake])-=(-(=[:90]O)-[:-35]NH_2)-(<[:135]H)(<:[:45]H)-=)}
\end{document}