Arrange the following equimolar solutions according to increasing order of osmotic pressure [Assume complete ionisation]

i) KCl

ii) $\mathrm{BaCl}_2$

iii) $\mathrm{AlCl}_3$

iv) $\mathrm{Al}_2\left(\mathrm{SO}_4\right)_3$

Which from following is useful to extract analgesic and antimicrobial compounds?

Which element from following has smallest ionic size in +3 state?

Identify the monomers used in preparation of Nylon 2- nylon 6