(a) (i) Ishan's automobile radiator is filled with 1.0 kg of water. How many grams of ethylene glycol (Molar mass $=62 \mathrm{~g} \mathrm{~mol}^{-1}$ ) must Ishan add to get the freezing point of the solution lowered to $-2.8^{\circ} \mathrm{C}$. $\mathrm{K}_{\mathrm{f}}$ for water is $1.86{\mathrm{~K} \mathrm{~kg} . \mathrm{mol}^{-1} \text {. }}$

(ii) What type of deviation from Raoult's law is shown by ethanol and acetone mixture? Give reason.

OR

(b) (i) Boiling point of water at 750 mm Hg pressure is $99.68{ }^{\circ} \mathrm{C}$. How much sucrose (Molar mass $=342 \mathrm{~g} \mathrm{~mol}^{-1}$ ) is to be added to 500 g of water such that it boils at $100{ }^{\circ} \mathrm{C}$ ? $\left(\mathrm{K}_b\right.$ for water $=$ $0.52 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ ).

(ii) State Henry's law and write its any one application.

(a) An organic compound (A) with the molecular formula $\mathrm{C}_9 \mathrm{H}_{10} \mathrm{O}$ forms 2, 4-DNP derivative, reduces Fehling solution and undergoes Cannizzaro reaction. On vigorous oxidation, it gives 1, 2-benzene dicarboxylic acid.

(i) Identify the compound (A) and write its IUPAC name.

(ii) Write the reaction of compound (A) with

(1) 2,4-Dinitrophenyl hydrazine and

(2) Fehling solution

(iii) Write the equation of compound (A) when it undergoes Cannizzaro reaction.

OR

(b) (i) Account for the following:

(1) The alpha ( $\alpha$ )-hydrogens of aldehydes and ketones are acidic in nature.

(2) Oxidation of aldehydes is easier than ketones.

(ii) Arrange the following in :

(1) Decreasing reactivity towards nucleophilic addition reaction propanal, acetone, benzaldehyde.

(2) Increasing order of boiling point: Propane, Ethanol, Dimethylether, Propanal

(iii) Give simple chemical test to distinguish between Benzoic acid and Benzaldehyde.