Which from following statements is NOT true according to principles of green chemistry?

The molar conductivity of 0.02 M KCl solution is $410 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$ at $25^{\circ} \mathrm{C}$. Calculate its conductivity?

What is the coordination number of a particle in hcp structure?

Identify essential amino acid from following.