Which of the following reactions cannot be used to prepare benzaldehyde?

Benzonitrile on reduction with stannous chloride $(SnCl_2)$ in the presence of hydrochloric acid $(HCl)$ followed by acid hydrolysis forms,

Identify the name of the following reaction:
$Toluene + CrO_2Cl_2$ $\xrightarrow{CS_2} \text{complex}$ $\xrightarrow{H_3O^+} \text{Benzaldehyde}$

Identify the 'product' in the following reaction: $\text{Pent-3-enenitrile} \xrightarrow{DIBAL-H, H_3O^+} \text{Product}$

Identify the product obtained when benzoyl chloride is treated with dimethyl cadmium.

Give names of the reagents to bring about the following transformations:
$(i)$ $\text{Hexan-}1\text{-ol}$ to $\text{hexanal}$
$(ii)$ $\text{Cyclohexanol}$ to $\text{cyclohexanone}$
$(iii)$ $p\text{-Fluorotoluene}$ to $p\text{-fluorobenzaldehyde}$
$(iv)$ $\text{Ethanenitrile}$ to $\text{ethanal}$
$(v)$ $\text{Allyl alcohol}$ to $\text{propenal}$
$(vi)$ $\text{But-}2\text{-ene}$ to $\text{ethanal}$