Arrange the following compounds in the correct order of their boiling points:
$(I) \, CH_3CH_2CH_2CH_2OH$
$(II) \, CH_3CH_2CH_2CHO$
$(III) \, CH_3CH_2CH_2COOH$

What are $X, Y, Z$ in the following reaction sequence?
$CH_3-CH=CH-CH_3$ $\xrightarrow{X} CH_3COOH$ $\xrightarrow{Y} CH_3COCl$ $\xrightarrow[\text{Anhy. } AlCl_3]{\text{Benzene}} Z$

The product $(C)$ of the given reaction sequence is:

$CH_3-CO-CH_2-CH_2-CH_2-CO_2H \xrightarrow[(ii) H_2O, H^+]{(i) NaBH_4} ?$
What will be the final product of this transformation?

Write chemical reactions to affect the following transformations:
$(i)$ Butan$-1-$ol to butanoic acid
$(ii)$ Benzyl alcohol to phenylethanoic acid
$(iii)$ $3-$Nitrobromobenzene to $3-$nitrobenzoic acid
$(iv)$ $4-$Methylacetophenone to benzene$-1,4-$dicarboxylic acid
$(v)$ Cyclohexene to hexane$-1,6-$dioic acid
$(vi)$ Butanal to butanoic acid.

The product is: