Which of the following compounds contains chlorine in +5 oxidation state?

Which from following n mole molecules of carbohydrate contains 2 n mole molecules of galactose, $n$ moles of glucose and $n$ moles of fructose in it?

Calculate $\left[\mathrm{H}_3 \mathrm{O}^{+}\right]$ of a monobasic acid if it is $0.04 \%$ dissociated in 0.05 M solution.

Identify an aromatic, mixed, $3^{\circ}$ amine among the following compounds.