Identify substrate ' $A$ ' in the following reaction.

$\mathrm{A}+\mathrm{CO}_2 \xrightarrow[6 \text { atm }]{398 \mathrm{~K}}$ Sodium salicylate $\xrightarrow{\mathrm{H}_3 \mathrm{O}^{+}}$Salicylic acid

Which among the following compounds has lowest boiling point?

Identify the major product obtained when anisole reacts with bromine in acetic acid.

Identify the substrate ' X ' in the following reaction.

$$ \mathrm{X}+\underset{\text { (air) }}{\mathrm{O}_2} \xrightarrow[\text { ii) dil HCl } \Delta]{\text { i) Co-naphenate } 423 \mathrm{~K}} \text { Phenol }+ \text { Acetone } $$