Identify the reagent used in following conversion.

Pent -3 -enenitrile $$\xrightarrow{\mathrm{A}}$$ pent -3 -enal

What is the product formed when side chain chlorination of toluene is carried out followed by acid hydrolysis at $$373 \mathrm{~K}$$ ?

Identify the product '$$B$$' in following reaction.

$$2 \mathrm{CH}_3 \mathrm{CHO} \xrightarrow{\text { dil. } \mathrm{NaOH}} \mathrm{A} \xrightarrow[-\mathrm{H}_2 \mathrm{O}]{\Delta} \mathrm{B}$$

Identify 'A' in following reaction.

A $$\mathrm{\buildrel {Dimethyl\,cadmium} \over \longrightarrow}$$ propanone + cadmium chloride