Which of the following reagents/reactions will convert $A$ to $B$?

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 $\xrightarrow{1. CrO_{2}Cl_{2}, 2. H_{3}O^{+}}$

What is the reaction called in which toluene is oxidized to benzaldehyde in the presence of chromyl chloride?

Acetophenone cannot be prepared easily starting from

Identify the correct reagents that would bring about the following transformation: $Cyclohexyl-CH_2-CH=CH_2 \rightarrow Cyclohexyl-CH_2-CH_2-CH_2-CHO$

Acetic acid is treated with $Ca(OH)_2$ and the product so obtained is subjected to dry distillation. The final product is