Salicylic acid is treated with bromine under two different conditions.

 

Predict the nature of $\left[\mathrm{X}\right]$ and $\left[\mathrm{Y}\right]$ in the above reactions.

 

Among the following compounds, the most acidic is:

.

Given three acids:

The correct order of ease of acid catalysed esterification is:

${\mathrm{C}}^{*}$ is within the product:

The product, of which of the following reaction is capable of changing orange colour of ${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$ to green colour of ${\mathrm{Cr}}^{+3}$?