What is the number of moles of secondary carbon atoms in $$\mathrm{n}$$ mole isopentane?

Which from following substances consists of total 1 mole atoms in it? (Molar mass of $$\mathrm{NH}_3=17, \mathrm{H}_2 \mathrm{O}=18, \mathrm{~N}_2=28, \mathrm{CO}_2=44$$ )

Identify the formula of potassium trioxalatoaluminate(III).

If, Aniline $$\frac{\text { i) } \mathrm{NaNO}_2+\mathrm{HCl}, 273 \mathrm{~K}}{\text { ii) } \mathrm{H}_2 \mathrm{O}, \Delta}$$ Product.

Identify the product of above reaction.