Complete each synthesis by providing the missing starting material, reagent, or products for the following reactions:

(N/A) $(i)$ Ethylbenzene + $KMnO_4/KOH, \Delta \rightarrow$ Benzoic acid $(C_6H_5COOH)$
$(ii)$ Phthalic acid + $SOCl_2, \Delta \rightarrow$ Phthaloyl chloride $(C_6H_4(COCl)_2)$
$(iii)$ Benzaldehyde + Semicarbazide $(H_2NCONHNH_2)$ $\rightarrow$ Benzaldehyde semicarbazone $(C_6H_5CH=NNHCONH_2)$
$(iv)$ Benzene + Benzoyl chloride $(C_6H_5COCl)$ + $AlCl_3 \rightarrow$ Benzophenone $(C_6H_5COC_6H_5)$
$(v)$ $4$-Oxocyclohexanecarbaldehyde + Tollens' reagent $[Ag(NH_3)_2]^+$ $\rightarrow$ $4$-Oxocyclohexanecarboxylic acid
$(vi)$ $2$-Formylbenzoic acid + $NaCN/HCl \rightarrow$ $2$-($1$-hydroxy-$1$-cyanomethyl)benzoic acid
$(vii)$ Benzaldehyde + Propanal + $dil. NaOH, \Delta \rightarrow$ $2$-Methyl-$3$-phenylprop-$2$-enal (Cross-Aldol product)
$(viii)$ Ethyl acetoacetate + $(i) NaBH_4, (ii) H^+ \rightarrow$ Ethyl $3$-hydroxybutanoate $(CH_3CH(OH)CH_2COOC_2H_5)$
$(ix)$ Cyclohexanol + $CrO_3 \rightarrow$ Cyclohexanone
$(x)$ Methylenecyclohexane + $(i) B_2H_6, (ii) H_2O_2/OH^- \rightarrow$ Cyclohexylmethanol (Hydroboration-oxidation)
$(xi)$ $1,1'$-Bicyclohexylidene + $(i) O_3, (ii) Zn-H_2O \rightarrow$ $2$ Cyclohexanone