Calculate Henry's law constant if solubility of gas in water at $25^{\circ} \mathrm{C}$ is $5.14 \times 10^{-4} \mathrm{~mol} \mathrm{dm}^{-3}$ and partial pressure of the gas is 0.75 bar above solution.

What is the total number of orbitals present in N shell?

What is value of percent atom economy when reactants having sum of formula weight 78 u results in the formation of a product with formula weight 65 u ?

Identify the product formed in the following reaction.

$\mathrm{CH_3CH_2MgBr}$ $$\mathrm{\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{ii)\,dil.\,HCl}^{i)\,dry\,ice/dry\,ether}}}$$ $\mathrm{product}$