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

Write a note on the preparation of aldehydes and ketones from the oxidation of alcohols.

What are $X$ and $Y$ in the following reaction sequence?
$C_5H_{12}O$ $\xrightarrow[573 \ K]{Cu} C_5H_{10}$ $\xrightarrow[\text{(ii) } Zn/H_2O]{\text{(i) } O_3} X + Y$

Name the following reaction: $C_6H_5COCl + H_2 \xrightarrow{Pd-BaSO_4} C_6H_5CHO + HCl$

Among the following,the number of reaction$(s)$ that produce$(s)$ benzaldehyde is

The correct match between Item-$I$ (starting material) and Item-$II$ (reagent) for the preparation of benzaldehyde is :

Item-$I$	Item-$II$
$I$. Benzene	$P$. $HCl$ and $SnCl_2, H_3O^{+}$
$II$. Benzonitrile	$Q$. $H_2, Pd-BaSO_4, S$ and quinoline
$III$. Benzoyl Chloride	$R$. $CO, HCl$ and $AlCl_3$