Which among the following group-15 elements does not react with concentrated sulphuric acid?

What will be the concentration of $$\mathrm{NaCl}$$ solution, if the molar conductivity and conductivity of $$\mathrm{NaCl}$$ solution is $$124.3 \Omega^{-1} \mathrm{~cm}^2 \mathrm{~mol}^{-1}$$ and $$1.243 \times 10^{-4} \Omega^{-1} \mathrm{~cm}^2$$ respectively?

Which among the following is an example of allylic alcohol?

Which among the following amino acids has lowest molar mass?