31. (a) (i) Complete the following reactions by writing the structure of the main products : (I) Cyclohexanone + $ ext{H}_2 ext{NCONH} - ext{NH}_2 \longrightarrow$ (II) $( ext{CH}_3)_2 ext{Cd} + 2 ext{CH}_3 ext{COCl} \longrightarrow$ (III) Benzoyl chloride + $ ext{H}_2$ over $ ext{Pd} - ext{BaSO}_4 \longrightarrow$ (ii) Give simple chemical test to distinguish between the following pairs of compounds : (I) Ethyl benzoate and benzoic acid (II) Propanal and propanone OR (b) (i) Complete each synthesis by giving missing starting material, reagent or products : (I) Ethylbenzene $\xrightarrow[ ext{(ii) } ext{H}_3 ext{O}^+]{ ext{(i) } ext{KMnO}_4, ext{ KOH}} ?$ (II) Methylenecyclohexane $\xrightarrow{?}$ Cyclohexanecarbaldehyde (III) 4-Oxocyclohexanecarbaldehyde + $[ ext{Ag}( ext{NH}_3)_2]^+ \longrightarrow ?$ (ii) Carry out the following conversions : (I) Benzaldehyde to Benzophenone (II) Benzaldehyde to 3-phenylpropanol