Dry distillation of a mixture of calcium formate and calcium acetate gives. 

Write the structures of products of the following reaction:

${\mathrm{H}}_3\mathrm{C}-\mathrm{C}\equiv \mathrm{C}-\mathrm{H}\stackrel{\mathrm{H}{\mathrm{g}}^{2+}, {\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4}{\to }$

Benzaldehyde when treated with alkaline ${\mathrm{KMnO}}_4$ yields