In the given options,which one is correct for the rate of hydrolysis?

What will be $X$ and $Y$ in the following reactions?

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

Give plausible explanation for each of the following:
$(i)$ Cyclohexanone forms cyanohydrin in good yield but $2,2,6-$trimethylcyclohexanone does not.
$(ii)$ There are two $-NH_2$ groups in semicarbazide. However,only one is involved in the formation of semicarbazones.
$(iii)$ During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst,the water or the ester should be removed as soon as it is formed.

In the reaction $Ph-COOH + NaHC^*O_3 \to \text{Product}$,the labeled carbon $C^*$ is found in which of the following products?

Which of the following compounds will undergo decarboxylation on heating?