$\mathrm{NaCl}+{\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7+{\mathrm{H}}_2{\mathrm{SO}}_4{⟶}^{\mathrm{\prime }}{A}^{\mathrm{\prime }}+\text{ other }$

Red orange colour vapor $\stackrel{\mathrm{NaOH}}{\to }$ yellow solution $\underset{{\mathrm{CH}}_3\mathrm{COOH}}{\overset{{\left({\mathrm{CH}}_3\mathrm{COO}\right)}_2\mathrm{Pb}}{\to }}$ 'B' yellow pp.

Choose the incorrect statement :

A and B are isostructural

A and B have ${\mathrm{d}}^3\mathrm{s}$ hybridisation 

A is coloured due to the presence of unpaired electron

both have same number of $p\pi -d\pi$ bond