Which of the following reagents is used in the Etard reaction?

Identify the product $(A)$ in the following reaction:
$4-\text{tert-butylcyclohexanol} + \text{PCC} \xrightarrow{\text{CH}_2\text{Cl}_2} (A)$

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 $\text{ethanal}$

What is $A$ in the following reaction?
$CH_3-CH=CH-CH_2-CH_2-CN \xrightarrow[\text{2) } H_2O]{\text{1) } AlH(i-Bu)_2} (A)$

Identify $Z$ in the following sequence of reactions.
$C_2H_4Br_2$ $\xrightarrow[\text{(ii) } NaNH_2]{\text{(i) alc- } KOH} X$ $\xrightarrow[\text{Red hot}]{\text{Fe tube, } 873 \ K} Y$ $\xrightarrow[\Delta]{\left(CH_3CO\right)_2O / \text{Anhyd-} AlCl_3} Z$

Acetophenone is prepared by the reaction of which of the following in the presence of $AlCl_3$ catalyst?