Which of the following alkenes, on oxidation by $\mathrm{KMnO}_4$ in dil. $\mathrm{H}_2 \mathrm{SO}_4$ forms adipic acid?

Calculate the molality of the solution containing nonvolatile solute if boiling point elevation of solution is 0.39 K .

[ $\mathrm{K}_{\mathrm{b}}$ of water $=0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ ]

Which from following polymers is used to obtain rubber belts?

Identify anionic ligand from following.