Identify the product formed in the following reaction.

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

Which from following is a mineral of copper?

Identify dispersed phase and dispersion medium in fog respectively.

Ethers when dissolved in cold concentrated sulfuric acid forms,