$C{H_3} - CH = C{H_2}\mathop {\xrightarrow{{{\text{Water gas (}}CO + {H_2})}}}\limits_{{{400}\,^o}C,{\kern 1pt} {H_3}P{O_4}} $ $\mathop {\begin{array}{*{20}{c}}
{\,\,\,\,\,\,\,COOH} \\
{|\,\,\,\,} \\
{C{H_3} - CH - C{H_3}}
\end{array}}\limits_{Isobutyric\,acid} $
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$(a)\ Pb^{+2} > Pb^{+4} , Tl^{+1} < Tl^{+3}$
$(b)\ Bi^{+3} < Sb^{+3 }, Sn^{+2} < Sn^{+4}$
$(c)\ Pb^{+2} > Pb^{+4} , Bi^{+3} > Bi^{+5}$
$(d)\ Tl^{+3} < In^{+3} , Sn^{+2} > Sn^{+4}$
$(e)\ Sn^{+24} < Pb^{+2} , Sn^{+4} > Pb^{+4}$
$(f)\ Sn^{+2} < Pb^{+2} , Sn^{+4} < Pb^{+4}$
$A.$ has completely filled $\pi$ antibonding molecular orbitals
$B.$ is diamagnetic
$C.$ has bond order one
$D.$ is isoelectronic with Neon