The internal energy change (in J) When 90 g of water undergoes complete evaporation at 100^oC is ____________.

(Given : $$\Delta $$H_vap for water at 373 K = 41 kJ/mol,
R = 8.314 JK^–1 mol^–1)

The number of chiral carbons present in the molecule given below is _____ .

The increasing order of the following compounds towards HCN addition is :

The major aromatic product C in the following reaction sequence will be :