begin{center}
setchemfig{cram width=3pt}
schemestart
subscheme{
chemleft[
chemfig{@{F}Lewis{0:2:4:6:,F}}
chemright]}
+
chemfig{F-@{B}{phantom{B}}(-[2,0,,,draw=none]{})(<[:-20]F)<:[:20]F}
arrow{->}
chemleft[
chemfig{chembelow[0.5pt]{F}{scriptstylehspace{4.5mm}oplus}-[:-90,0.8]@{cb}chemabove[0.5pt]{B}{scriptstylehspace{4.5mm}ominus}(<:[:-40,0.8]F)(<[:-70,0.8]F)-[:-140]F}
chemright]
schemestop
tikz[overlay,remember picture]{
begin{scope}[overlay,shift={(B)}]
draw[-] (-0.1,0.2) ..controls +(120:1) and +(60:1) .. (0.1,0.2);
draw[-,fill=black!10] (-0.1,-0.2) ..controls +(-120:1) and +(-60:1) ..
+(0.2,0);
end{scope}
node[fill=white,inner sep=0.1pt] at (B){{fontfamily{cmr}selectfont
B
}};
draw[-latex,shorten <=2pt] (F) ..controls +(90:1.7cm)and+(90:1cm)..
([yshift=9pt]B.north);
}
tikz[overlay,remember picture]{
draw[-latex,shorten <=2pt,densely dashed] ([yshift=9pt]cb.north) ..controls +(180:0.7) and +(-90:1).. +(-0.7,1) node[above,align=center] {scriptsize coordinate scriptsize covalent\ scriptsize bond};
}
chemmove{node[xshift=6pt] at (c2.north east) {$-$};}
chemmove{node[xshift=6pt] at (c3.north east) {$-$};}
end{center}

setchemfig{cram width=3pt}
chemnameinit{}
schemestart
chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]O-[:0]H}}{tikzmarknode{A}{Acetic
Acid}}
+
chemname{chemfig{H_{3}C-Lewis{2:,N}(<:[:-15]H)<[:-40]H}}{tikzmarknode{B}{Methylamine}}
arrow{<=>}
chemname{chemfig{H_{3}C-C(=[:45]O)-[:-45]Orlap{${}^-$}}}{tikzmarknode{C}{Acetate
Ion}}
+
chemname{chemfig{H_{3}C-Nrlap{${}^+$}(-[:45]H)(<:[:-15]H)<[:-40]H}}{tikzmarknode{D}{Mathylammonium
Ion}}
schemestop
begin{tikzpicture}[overlay,remember picture]
node[below=3mm of A,fill=dullblue,draw,ellipse] (Acid1) {Acid};
node[below=3mm of B,draw,ellipse] (Base1) {Base};
node[below=3mm of C,fill=dullblue,draw,ellipse] (Base2) {Base};
node[below=3mm of D,draw,ellipse] (Acid2) {Acid};
draw[blue!50] (Acid1) -- ++ (0,-1.5) coordinate(aux) -| (Base2);
draw (Base1) -- ++ (0,-2)  -| (Acid2);
node[anchor=south,blue!50,fill=white,outer sep=1pt] at (aux-|Base1) {Conjugate pair};
end{tikzpicture}

usepackage{chemfig}
usepackage{tikz}
usetikzlibrary{tikzmark,positioning,shapes.geometric}
definecolor{dullblue}{RGB}{178,201,231}