The correct order of acidic strength of the major products formed in the given reactions, is :

A. $\mathrm{PhNH}_2 \xrightarrow[\substack{\text { (2) } \mathrm{CuCN}^2 \\ \text { (3) } \mathrm{H}_3 \mathrm{O}^{+} / \Delta}]{\text { (1) } \mathrm{NaNO}_2+\mathrm{HCl}\left(<5^{\circ} \mathrm{C}\right)}[\mathrm{A}]$

B. $\mathrm{CH}_3 \mathrm{CH}_2 \mathrm{CHO} \xrightarrow[ \Delta]{\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right]^{+}, \mathrm{OH}^{-}}[\mathrm{B}]$

C. $\mathrm{CH}_4+\mathrm{O}_2 \xrightarrow[\text { (ii) } \mathrm{Na}_2 \mathrm{Cr}_2 \mathrm{O}_7 / \mathrm{H}^{+}]{\text {(i) } \mathrm{Mo}_2 \mathrm{O}_3}[\mathrm{C}]$

D. $\mathrm{PhCH}_2 \mathrm{MgBr}+\mathrm{CO}_2 \xrightarrow[\mathrm{H}_3 \mathrm{O}^{+}]{\text {Dry ether }}[\mathrm{D}]$

Choose the correct answer from the options given below :

Consider the following aqueous solutions.

I. 2.2 g Glucose in 125 mL of solution.

II. 1.9 g Calcium chloride in 250 mL of solution.

III. 9.0 g Urea in 500 mL of solution.

IV. 20.5 g Aluminium sulphate in 750 mL of solution.

The correct increasing order of boiling point of these solutions will be :

[Given : Molar mass in g mol⁻¹ : H = 1, C = 12, N = 14, O = 16, Cl = 35.5, Ca = 40, Al = 27 and S = 32]

A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is _________. (Given Molar mass in g mol⁻¹ S: 32, BaSO₄: 233)