What is IUPAC name of the following compound?

The enthalpy of vaporisation of a liquid is $30 \mathrm{~kJ} \mathrm{~mol}^{-1}$ and entropy of vaporisation is $75 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$. Calculate boiling point of liquid at 1 atm .

Which from following polymers is used as substitute for wool?

Which from following complexes is having ambidentate ligand in it?