Describe the following: Decarboxylation.

 Complete each synthesis by giving missing starting material, reagent or products.

Complete each synthesis by giving missing starting material, reagent or products.

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{C}\mathrm{H}\mathrm{O}\stackrel{{\mathrm{H}}_2\mathrm{N}\mathrm{C}\mathrm{O}\mathrm{N}\mathrm{H}\mathrm{N}{\mathrm{H}}_2}{\to }$

Complete each synthesis by giving missing starting material, reagent or products.
.

Complete each synthesis by giving missing starting material, reagent or products

Complete each synthesis by giving missing starting material, reagent or products.

Complete the following synthesis by giving missing starting material, reagent or products.

${\mathrm{C}}_6{\mathrm{H}}_5\mathrm{CHO}+{\mathrm{CH}}_3{\mathrm{CH}}_2\mathrm{CHO}\underset{∆}{\overset{\mathrm{dil}.\mathrm{NaOH}}{\to }}$

Complete the synthesis by giving missing starting material, reagent or products.
${\mathrm{CH}}_3{\mathrm{COCH}}_2{\mathrm{COOC}}_2{\mathrm{H}}_5\underset{\left(\mathrm{ii}\right) {\mathrm{H}}^{+}}{\overset{\left(\mathrm{i}\right){\mathrm{NaBH}}_4}{\to }}$