CBSE 12th Chemistry Question Paper 2022 (Set 2)

(i) PhMgBr and then H3O+: CH3CH2CH(OH)Ph (1-phenylpropan-1-ol). (ii) LiAlH4: CH3CH2CH2OH (propan-1-ol). (iii) HCN: CH3CH2CH(OH)CN (2-hydroxybutanenitrile).

Molar conductivity is the conducting power of all the ions produced by dissolving one mole of an electrolyte in a solution. It is defined as κ/c. It increases with decrease in concentration because the total volume of solution containing one mole of electrolyte increases, leading to an increase in the degree of dissociation and mobility of ions.

Average Rate = -1/2 * (Δ[N2O5]/Δt) = -1/2 * (0.4 - 0.5)/10 = 0.005 mol L^-1 min^-1. Rate of production of NO2 = 4 * Rate of reaction (using stoichiometry) = 4 * (Rate of -1/2 * Δ[N2O5]/Δt) = 2 * (0.1/10) = 0.02 mol L^-1 min^-1.

(i) Due to their ability to adopt multiple oxidation states and form complexes, providing a large surface area for reactants to adsorb. (ii) They have completely filled d-orbitals (d10) in their ground state and excited state. (iii) Due to the lanthanoid contraction, which offsets the expected increase in atomic size.

(i) Due to the extra stability of the half-filled d5 configuration in Mn2+. (ii) Irregularities arise due to varying trends in first and second ionization enthalpies along with sublimation and hydration energies. (iii) Because the high energy required to transform Cu(s) to Cu2+(aq) is not compensated by its hydration enthalpy.