Nitration of salicylic acid

Q. Salicylic acid reacts with carbolic acid to give:

Q. Benzoic acid & salicylic acid can be distinguished by:

Q. (a) Describe the conformations of cyclohexanol. Comment on their stability
(b) How are the following conversions carried out?
(i) Salicylic acid$\to$ aspirin
(ii) Salicylic acid$\to$ methyl salicylate
(iii) Formic acid $\to$ formamide

Q. Salicylic acid on bromination gives: