Provide the missing product in the following reaction:
$CH_3-CH=CH-CH_2OH \xrightarrow{PCC} (?)$

What are $X$ and $Y$ in the following reactions?

Identify the product of the following reaction:
$C_6H_6 + CO + HCl \xrightarrow{AlCl_3} \text{Product}$

$Ph - C \equiv C - CH_3 \xrightarrow{Hg^{2+}/H^+} A$. What is $A$?

Write the structures of products of the following reactions:
$(i)$ Benzene + $C_{2}H_{5}COCl$ $\xrightarrow{\text{Anhyd. } AlCl_{3}, CS_{2}}$
$(ii)$ $(C_{6}H_{5}CH_{2})_{2}Cd + 2 CH_{3}COCl \rightarrow$
$(iii)$ $H_{3}C - C \equiv C - H$ $\xrightarrow{Hg^{2+}, H_{2}SO_{4}}$
$(iv)$ $p$-Nitrotoluene $\xrightarrow{1. CrO_{2}Cl_{2}, 2. H_{3}O^{+}}$

Which of the following reagents is used in the reaction shown below?
Benzoyl chloride $\stackrel{?}{\longrightarrow}$ Benzaldehyde